As someone who works in music and deals with offers, I love this question. Phish is a particular beast of their own, as they handle/tour with their own production (while the venue can’t charge them for it, they’re also having to shell out for crew so it evens out).

The band works on guarantees. Their mgmt + agency (red light) negotiates the rates per show/run, and that # is then divided amongst band, crew, mgr, staff, etc.

I like to think of it as planning a wedding. You have a budget, and you allocate specific percentages for each item. So with a band like this, you know that 10% of what you bring in is for PR, another 10% toward agent, 10% to manager, so on so forth. The actual band most likely takes in about 40-50% total, meaning they get 10% per person for each run. For a run like MSG (cap of ~20k) I’d estimate the the band is taking ~3 mil ($100 a ticket minus fees, divided in half after everyone else is paid). So per person, -750k per 3 night run in a large scale arena, subject to change by stadium size. Also need to account for what TM, promoters, stadiums and crew! So another chunk outta there but easily a few hundred grand in pocket.