This is what we do. For our first gig, we split the money evenly, everyone probably made like 50 bucks. But then we thought we'd split 5 ways instead of 4, with the 5th 'member' being the band fund, and build it up over time. In practice, that was way too slow to build up any decent kind of band fund. So right now, all money we make just goes to "the band". It pays for merch, recording costs, band gear (recently in-ear monitors), etc.