I know you’re not looking for a serious answer, but I did discuss this on another thread where Merces become useless the more you play, and without any kind of money sink, they just… pile up over time.
I think there’s a trophy for accumulating 1 million Merces, but that seems…strange to encourage.
Hell, I’ve known about this issue since May-June of last year:
Best thing I can think of is just to play the stock market and enjoy putting 47 in ridiculous costumes.
I’m not even at 300K Merces, and that’s what I do =P