In my personal experience:

I make everything I need myself and I always have all the mats I need from just gathering while questing (Not farming, just picking up stuff en route).

I find that the only goods that sell (well/reliably) are max level set items (not all, but a choice few), motifs 10-14, consummate recipes, tempers, runes, cooking mats for fortified/consummate versions and a few alchemy mats.

Generally, rare mats sell a lot better - and for a higher price - than the items they're needed for. This even applies to foods, where it can't be argued that there are too many variations like with equipment.

I don't participate in trading right now as its too time consuming and difficult to do.

Without a guild I don't have access to trade hubs and spamming in chat isn't so fun either

I do a daily farm round, sell crafting materials, motifs and goods. My twinks often need special crafting materials for new equip, so I buy it.

I don't do cooking or alchemy, these rare receipes and goods are a nice daily income.

Trading guilds, I'm in three different. A french, englisch and international one. So I can pick up the chapest to buy for my own and best price for sale. I don't buy from one guild to sale in another .... not my kind of style.

I only really buy resins, and I sell motifs. I can make all the armour and weapons I need for myself - and I go and collect the materials for it.

Rarely Buy, Regularly sell? Methinks you missed one. I have about 30 items in the Guild Store including additional recipes and racial motifs. I simply set a formulaic price, I'm not truly bothered about the sales. Being a Guild Store, it doesn't get much traffic.

No point.

Have all motif's
Have maxed out horses.
Have full legendary gear I farmed myself.
I make my own potions.

Gold is good for repairs. And buying the dwemer motif in 1.5... until then it collects dust.

I was in a trade guild for awhile, and used to sell raw materials, recipes, etc. there, but I went on vacation and was removed for inactivity, so now I pretty much just vendor everything, which I assume doesn't count in this poll.

The answer I chose was not entirely accurate in my case, but it was the closest one to the truth, which is:

I do not sell to other players at all. This is because I do not belong to a guild and I will not clutter up zone chat with 'WTS' messages.

If I don't need something I loot/find, I vendor it (except purple/gold motifs, or purple recipes, which I have found 'extras' of - I store those on a mule).

I do occasionally buy (from Guild Traders) - usually provisioning recipes or ingredients, or the occasional temper or resin, if I'm running short (and if the price is right ... I'm a dyed-in-the-wool cheapskate, hahaha!)

This game really needs a global marketplace of some sort, in my opinion.

I won't argue the point with anyone though, because 1) you ain't changing my mind, 2) I'm not trying to change anyone else's mind, and 3) I've got better things to do than rehash something on these boards that I know has been discussed at length (yeah, this one knows how to use the search feature).

Never. There's no auction house, and I'm not going to join a guild just for some small pseudo auction house.

I rarely buy anything, but sometimes if it is something I use a lot of, and see it in the zone chat at a reasonable price I make an offer.
If I see someone who needs things for their main craft, or something they clearly need to keep their finances stable I will send my overflow and leave it up to the recipient where or not they pay for it.

I keep myself solvent by doing a quick run through a city that has provisioning mats for 4 gold meals ~ with the 4 x perk per mats used, and not using recipes that consume rare ingredients I net at least 2,000g in +- 10 mins. Enough to keep my gear in shape and kept 3 horses fed while leveling them.

Fishing has been good to me, both with a bit of welcome gold, relaxation and pure fun, and what with gunny sacks and chests spawning multiple times next to the hole I happen to currently be fishing, it has kept me well supplied with gold, soul gems, and rare mats and runes.
Half the fun with those gunny sacks is the fact that any zone can give you Ta - Kuta, essence runes, honing stones - Dwarven Oil, or just racial stones.

I seldom farm, usually just collect on my way to a destination.

I NPC everything, except for whatever I use to deconstruct or store for crafting, and perhaps the odd piece that I might actually use with one of my characters.

The "trading system" in ESO is extremely cumbersome, lackluster and time consuming. On top of all the micro management. No thanks. I would rather not spend my precious time on all this irrelevant stuff.

Since I started alchemy, I started selling more. I'll sell extra potions, mats, recipes, motiffs, etc I find. And I'll buy recipes and runes I don't have.

Ourorboros wrote: »

(...)

that Master Refiner achievement is

(...)

... mine!

I just got mine last night!

(And you're absolutely right - it was grueling business, to be sure.)