[Supaman771]

Sage left because a Management change, wasn't his fault.

I was the only other one who kinda worked with him and kept adding achievements and stuff, but I quit too. So, I doubt the people left even know how to modify it.

Though Sage tends to rejoin the team often he has never been one to finish anything. Perhaps some courageous soul could come along and save this system, though I doubt it; cause imo the entire concept is flawed.
That in, it is a non-renewable currency. Get all the achievements? Buy something with the coins? GG... can't buy anything else, can't get more coins, everyone gets basically the same prize since the coin limit is the same: thus it's worthless.

I honestly don't see a way to correct that flaw without an unlimited supply of achievements added constantly (never gonna happen).