Even sidemen need to be paid. They're investing time learning your tunes and money in their gear as well unless when you say "all the gear" you mean all of their guitars and all of their amps too and I don't think you do. The words "if we get a gig" are important too. That tells me you aren't getting paid gigs now so everyone is donating time and effort to the cause. If you are the leader and principal driver behind the band in both it's artistic and business dealings then you should be entitled to a larger cut to compensate for that. But as a player you're no more important to the whole than they are. So work out ahead of time what you feel is fair for that work. If you took 15%-20% off the top then split the rest that would probably be fair to them. Just get it all worked out before you begin to gig and that way no one will be surprised or upset after the fact. Unless you plan on doing a solo act you need them.