If a booker doesn't mention money when they book you, don't assume they will. Especially when you're starting out, they may know they can take advantage of your newness. As practice for your future ability to negotiate, you should bring it up if they don't. If they don't, maybe you shouldn't work with them. Don't buy the "you're doing it for the exposure" line - although as with everything, there are exceptions. In general, we feel strongly believe that producers should be talking about pay when they book you. If someone keeps postponing paying you, you'll know not to work with them again. And for all the shady producers out there, there are some amazing producers that do their best to pay you and pay you promptly - show them gratitude and learn from them!
If you have a show, and somebody gets you booked on a show, and y’all don’t never talk about money, and they shake your hand and you walk out that door, and they don’t bring it up to you, expect not to get paid.
Ellis Aych