Should I use golden apples to farm half AP daily Treasure Vault?

Save them for lottery events

Honestly, I wouldn't do it unless i was really REALLY low on QP and i have a ton of skills to level... how much QP do you have rn? If you have enough i would definitely recommend saving them for events, especially lootbox ones

We have 2 lottery events in the next year IIRC, and unless you're a madman you don't need more than 25-50 goldens for each. You'll get way more apples before then.

If you're actually limited heavily by QP then you can't beat this node for QP efficiency. However unless you have a lot of SSRs to level you probably can just use natural regen.

For sure like people said save them for lotteries. But, unless I'm reading the schedule wrong, the first lottery of the year is sometime in August(NeroFest) and the second is our new Christmas event. So you'll have time to build an apple collection.

All in all it's up to you and your plans. I'm gonna be using both gold apples and rainbow apples because of future plans(10/10/10 Caster Nero maybe even grailed TBD). Lottery events are perfect for earning QP but with all of those in the second half I'm gonna get what I need to during this 1/2 AP "dead week".

You lucky I gotta farm with SQ