The problem is a set supply of appraisers ( with a number aging out of the profession ) and a work demand for orders that goes in cycles of busy and slow. In a slow cycle, there can be a surplus of appraisers, whereas in a busy cycle, there is a shortage of appraisers. So unless lenders want to subsidize appraisers in slow cycles (sarcasm ), pay them to sit a year on standby so they can be at the ready when it gets busy, the cycle of shortage and surplus will continue. The Appraisers on staff get laid off in a slow time too so that is not a safe harbor either.
The cycle of slow and busy is made far worse by the fact that when it gets slow, the AMC's employ their worst tactics of reducing fees. Appraisers remember that in the busy times and might ignore pleas from the AMC's who screw them over in a slow work cycle.
My experience is also that by taking an order from a very low volume client, even at a good fee, distracts from being able to finish orders on time for my steady clients, and it becomes simply not worth it to take on orders from a small AMC or lender that might only call once or twice a year -- I always regret taking these on no matter the fee, they always somehow take a longer time and make me late for my good clients and why should I risk that to help out some company I might never hear from again.
The continually expanding levels of scrutiny on res lending assignments make even a so called simple assignment a minefield - bidding is a PITA and takes time so why would an appraiser even bother to do it for an oddball assignment- lenders and AMC;s have themselves to blame for creating a "shortage" - they might attract newbies to train but will they stay in a field with despite having some good earning potential in a busy time, has built in limitations financially and where an appraiser is subject to intense scrutiny , ROV, and possible future reviews or complaints on any order no matter how mediocre the fee was.