Money is pretty easy to farm in this game once you know where to find stashes locked room and vaults, you might find yourself with too much money. 💰💰💰
I like being able to purchase the pirate boxes for a change of either getting stuff I don't want or super nice gear. On my second prestige , looking for Mac 10 attachments and k1 stocks kept me kinda poor.
My suggestion is introducing expensive items to spend my hard earned cash on.
Boxes with different gear can fit the bill especially if they introduce more guns and attachments.