Well that's kind of a broad question. I'm not really an expert, all I really sell in guild stores is perfect roe from fishing and void crafting materials from Craglorn.

I suppose this pricelist could be helpful to you:
http://tradelodge.blogspot.be/p/pricelist.html

It's not at all set in stone however, in my experience guild stores are very fickle. The same item or items might sell for amazingly high once and then sit at a bargain price for weeks when you try it again.

Edit: Oh and looking through that pricelist: never sell unrefined crafting materials such as ores and rough wood. Refining them gets you upgrade materials wich you can then sell for a much higher price. Especially with skill points in the correct passives like Wood extraction.

Things that typically sell well (on PC/NA):

Perfect Roe
Alchemy Reagents (bugloss, columbine, mountain flower, namira's rot, lady's smock -- sell the best)
Unrefined Crafting Mats (Note: Never sell refined crafting mats, people are buying these to refine them, not to make stuff with. If you have enough skill points in the passives that allow you to obtain more upgrade materials, it may be more beneficial to refine them yourself and sell the upgrade materials. However, get upgrade mats from refining is still largely based on RNG and it is often more worthwhile to just sell the unrefined mats and let the buyer deal with the fickleness of the RNG gods)
Recipes -- if priced fairly
Motifs -- if priced fairly
Purple and Gold upgrade materials
Provisioning ingredients -- if priced right (food typically sells for less than the ingredients used to make them)

Allyhoo811 wrote: »

Things that typically sell well (on PC/NA):

Perfect Roe
Alchemy Reagents (bugloss, columbine, mountain flower, namira's rot, lady's smock -- sell the best)
Unrefined Crafting Mats (Note: Never sell refined crafting mats, people are buying these to refine them, not to make stuff with. If you have enough skill points in the passives that allow you to obtain more upgrade materials, it may be more beneficial to refine them yourself and sell the upgrade materials. However, get upgrade mats from refining is still largely based on RNG and it is often more worthwhile to just sell the unrefined mats and let the buyer deal with the fickleness of the RNG gods)
Recipes -- if priced fairly
Motifs -- if priced fairly
Purple and Gold upgrade materials
Provisioning ingredients -- if priced right (food typically sells for less than the ingredients used to make them)

Disagree. You will never get the same price for a stack of 200 unrefined materials as you would get when you refine the whole stack and sell the upgrade materials. One single golden or two purple upgrade mats is 3k right there, and you will easily get that when refining 200 rough pieces.

Fat-Larry-Makes-All wrote: »

Allyhoo811 wrote: »

Things that typically sell well (on PC/NA):

Perfect Roe
Alchemy Reagents (bugloss, columbine, mountain flower, namira's rot, lady's smock -- sell the best)
Unrefined Crafting Mats (Note: Never sell refined crafting mats, people are buying these to refine them, not to make stuff with. If you have enough skill points in the passives that allow you to obtain more upgrade materials, it may be more beneficial to refine them yourself and sell the upgrade materials. However, get upgrade mats from refining is still largely based on RNG and it is often more worthwhile to just sell the unrefined mats and let the buyer deal with the fickleness of the RNG gods)
Recipes -- if priced fairly
Motifs -- if priced fairly
Purple and Gold upgrade materials
Provisioning ingredients -- if priced right (food typically sells for less than the ingredients used to make them)

Disagree. You will never get the same price for a stack of 200 unrefined materials as you would get when you refine the whole stack and sell the upgrade materials. One single golden or two purple upgrade mats is 3k right there, and you will easily get that when refining 200 rough pieces.

The RNG gods must just not like me then...I frequently refine stacks of 200 materials without getting a gold or 2 purples

Fat-Larry-Makes-All wrote: »

Allyhoo811 wrote: »

Fat-Larry-Makes-All wrote: »

Allyhoo811 wrote: »

Things that typically sell well (on PC/NA):

Perfect Roe
Alchemy Reagents (bugloss, columbine, mountain flower, namira's rot, lady's smock -- sell the best)
Unrefined Crafting Mats (Note: Never sell refined crafting mats, people are buying these to refine them, not to make stuff with. If you have enough skill points in the passives that allow you to obtain more upgrade materials, it may be more beneficial to refine them yourself and sell the upgrade materials. However, get upgrade mats from refining is still largely based on RNG and it is often more worthwhile to just sell the unrefined mats and let the buyer deal with the fickleness of the RNG gods)
Recipes -- if priced fairly
Motifs -- if priced fairly
Purple and Gold upgrade materials
Provisioning ingredients -- if priced right (food typically sells for less than the ingredients used to make them)

Disagree. You will never get the same price for a stack of 200 unrefined materials as you would get when you refine the whole stack and sell the upgrade materials. One single golden or two purple upgrade mats is 3k right there, and you will easily get that when refining 200 rough pieces.

The RNG gods must just not like me then...I frequently refine stacks of 200 materials without getting a gold or 2 purples

Really? That's odd.. I almost never refine a stack of 200 without getting a gold upgrade item. It's why I love harvesting every last node I see. Are you sure you've got skill-points in the correct passives? Without those you can't get purple or gold items from refining materials.

My luck is weird though, at Vet 7 I've found 2 dwemer motifs so far, without farming, but unfortunately they were both the exact same chapter.

Yup, I have all the passives in extraction (for woodworking and tailoring, I don't focus much on blacksmithing)...I guess RNG just hates me when it comes to this area of the game lol

Oddly, I have pretty good luck when it comes to getting gold items from hirelings and even harvest kuta runestones out in the wild fairly frequently. I'm also pretty lucky when it comes to perfect roe. But the particular RNG gods that control extraction and purple/gold motif looting are not my friends. Doesn't stop me from harvesting every node and opening every barrel, desk, and urn, though!