If you are talking about yearly morphable collectibles(link), they never put them into grab bags. After a while they may put them into a different merchant(like), but the price is exactly same.
Grab bags are for event-specific items. Items drop during ONLY that same event. For example, during the current event(Gates of Oblivion Celebration), it drops the Y'ffre’s Fallen-Wood armor style. Most probably, in the next GOC event, the Y'ffre’s Fallen-Wood armor style will drop again beside a new style. In the second next GOC event, (again most probably) they will put the Y'ffre’s Fallen-Wood armor style into a grab bag.

LunaFlora wrote: »

iPlayOnlyESO wrote: »

If you are talking about yearly morphable collectibles(link), they never put them into grab bags. After a while they may put them into a different merchant(like), but the price is exactly same.
Grab bags are for event-specific items. Items drop during ONLY that same event. For example, during the current event(Gates of Oblivion Celebration), it drops the Y'ffre’s Fallen-Wood armor style. Most probably, in the next GOC event, the Y'ffre’s Fallen-Wood armor style will drop again beside a new style. In the second next GOC event, (again most probably) they will put the Y'ffre’s Fallen-Wood armor style into a grab bag.

it drops the collectibles from the Bounties of Blackwood reward bundle.

the Pellucid Swamp Jelly pet and the shadows of blackwood tattoos.
i believe the voriplasm pet pieces as well.

You are right. I should have said "same content's event" instead of "same event". Bounties Of Blackwood and Gates of Oblivion Celebration are not same events but they have the Blackwood content in common so they are Blackwood events so they share some event items.
Besides, there are some exceptions like Voriplasm Pet. It was released on a Murkmire event then carried into a Blackwood Event.

The Voriplasm pet could be acquired by finding and using seven Voriplasm Trap parts, which could be found in Murkmire Strongboxes or bought from the Impresario for 5 Event Tickets during the Murkmire Celebration. Its default name is "Gibblegog".

The parts made a return during the Bounties of Blackwood event, where they could again be purchased from the Impresario or found in Blackwood Legates' Coffers.

Actually, as a story-ignorant person, the Blackwood and Murkmire enviroments also look alike to me, but I don't know. At the end Murkmire was not part of the GOC event.

Moreover, my style page example was just an example, there are other event/content-specific items like collectibles(pets, skins, costumes etc.) and furnishing items. My main point was there is a difference between
1. morphing collectibles (can be purchased on different/unrelated events until they release all the morphs) and
2. other event items.
They don't put the first one into a grab bag but into some merchant(like) selling for the same price(event ticket amount) before. They may put the latter one into a grab bag (usually after a long while).

Taking everything into account,

Would it then not be best to spend all tickets on Grab Bags rather than the current shop items, and get them in the future instead?

• If you are talking about morphs/morphing items(like Indriks), they sell them for the same price in the future.
• If you are talking about the other event items, best practice is don't buy them paying tickets. Get them dropped to you or buy them from guild traders for gold if they are not too expensive to you(If they are too expensive it's your choice: pay that gold or pay those tickets or wait +1 year until they put it into a grab bag).
• Usually, I take grab bags as they are for buying items from past events you hadn't joined and you can't farm them or you can't buy them(because they are not tradeable or over-priced on the market or extinct on the market).