I mean.. there's a lot of things to do, but not every activity is gonna be enjoyed by everyone.

The "issue" with having the Treasure Trove being permanent would be one of two things:
1.- People would no-life it in 2 days and then complain there's nothing else to do
2.- If it actually took time, people will then complain that it's too grindy

So I get what you're saying and in principle, I kinda like it actually and I think it wouldn't hurt just to have around, but it wouldn't solve the issue of the average forum complaint on whatever's the flavor of the month at the time.

Or maybe I'm wrong, I dunno.