Yeah, I'm in agreement with all of you, thanks for the reinforcement. Ultimately, about an hour after I posted, we decided over text just to split the money each gig. My main thing is that I don't want money to be an issue, and holding it in a band fund is recipe for disaster. A little more background probably would have helped in the first place.
We are a piano/bass/drums/vox group doing all covers (Jazz and R&B) and not at all musically ambitious. Mostly we are playing for fun. Not serious enough to consider hiring subs and such. The amounts of money you can make gigging around here is pretty small, and really not a significant stream of income for any of us (all middle aged stably employed people). Realistically, probably about 3 grand a year is the upper bound for what the band could make. Free practice at the key players house. Everybody owns their own decent gear and the singer owns the PA. Division of labor has been pretty equal. Keys player gets music when needed, I do most of the "booking," which is negligible, and social media, singer has been responsible for setting up set lists and such, drummer has landed a couple gigs, and, well, he's got the most stuff to move
What we've done so far, and has worked is that we split the gig money equally and have used the tips to stock the mini fridge that I donated to the practice space. We are having a band meeting next week just to hammer out a few hypotheticals for the future (what's the minimum we'd play for, are we willing to play free for friends, etc).
Anyway, thanks for the advice. I've been playing a long time (but off a while) and typically either in more hired gun situations, or in DIY bands that saved gig money for studio time, so this is sort of a new arrangement for me.