Suggestions

[Touc]

Ten grand is practically chump change thanks to dungeons.

Not necessarily, especially with the keys being made rarer. It's like saying 'Twenty grand is chump change because you can just sell a warcry gem.' Could it happen? Sure. 

Will you actually get it while breaking even or making a profit given that each box costs 3000 gold?

I won't, at least

With adventurer you get 7500 gold per dungeon. Gather 4 other friends who have no need for money and that's 37.5k coins. Keys are still popping up regularly (from what I've seen), thus making money is easy. Too easy, even.

Tldr; Give rebirth potions a limit otherwise they will inevitably be abused to no end. It might not matter too much a few months from now, when many people are rpl 200~, but this early into the wipe, they have disgusting potential.

I stand corrected, I forgot that Adventurer existed. Along with the ingredients supposedly being easy to get, maybe it would be best to change things up.