DH gets $80/mo in pocket cash, I get $50/mo. I spend very little of mine, DH can rarely make it into the 3rd week and still have more than a few bucks left. He spends his on Ebay or at thrift stores for crap like old radios, clocks, amplifiers, turntables, sometimes books and records. If he's out late on a thrift store run he may use it to pick up something to eat.
We have a budget category for things like clothing, haircuts, gifts, etc so it's not for things like that. It's just for his personal need to pick up old used stuff that other people don't want in their houses and he wants in his. Many times he has to buy parts for these old things and he fixes them with the intention of selling them on ebay or a garage sale. But mostly they sit in our house in an extra bedroom or the attic.
Before DH retired he used to use household money for his crap collecting "hobby". He was easily oblivious to how much he was spending using the debit card, but it was beyond reasonable. When he retired he agreed to limit it. So he still gets to do the thing he likes to do, he just has to keep it reasonable. I couldn't spend $80 if I tried, so $50 is fine for me.
I use mine for going out to lunch with my sister or a friend or for minor expenses that are mine and not for the household. Most months I still have $35 or more left at the end of the month and I accumulate the excess in a cash stash and save up for something USEFUL and NEW like the iPad mini I bought last year. I'd much rather have the cash or an occasional shiny new toy than piles of other people's discards.