Now that I have your attention...
Appraisers in areas where there is too much competition probably need to get creative and practice some guerilla warfare. Try organizing some appraiser groups and meet regularly (easier said than done, but it might work in your urban areas where it's not 100 miles to anywhere).
Refuse insulting fees and assignment conditions as being unprofessional and make sure you don't miss an opportunity to tell that to someone on the phone before hanging up.
Accept more review work, get good at it and relentlessly hammer poor work. The goal is to either end the cheaters or make them work as hard as you do.
Accept assignments that are royal PIA timewasters at higher fees and get good at them so that you will get these orders regularly but because no one else wants to. After they get easier increase your fees a little so that the time is shorter and the money larger. Works for me. I just got a $2,000 assignment from an AMC. Regular fees including review of at least $400 and can usually get five or six depending on the ridiculousness of the situation.
In my opinion AMC's are a numbers game and the more lists you're on the more the random full fee jobs come along. They might only call when some lender has asked for you, or when the scheduler gives up trying to find someone and is ready to bargain so she can get home on time. They're under a lot of pressure and sometimes it can be exploited. Apply at every opportunity even though it's a hassle. I don't worry too much about their stupid contracts. Each job is custom.