Personally I think that a trainee considering relocation with the sole purpose of getting a foothold in this business would be a really stupid financial move, especially if they don't already have a guaranteed job lined up with the supervisor providing an established client base. If there is truly a demand for apprentices in any given area, you can bet that in the time it would take for someone to pack their bags and relocate that the appraisal schools in that area will have churned out a hundred new eager graduates, many who will already have real estate backgrounds, business connections and a greater level of market familiarity in that area. The local trainee competition for jobs would already have a big advantage.
Though the poll for income levels of first-year trainees is new, it gives an indication of what one can expect to make during a peak market period (the last three years). Most appraisers agree that those were the feast times and are not likely to repeat themselves again in the near future, so I think it's safe to say that the poll results are on the optimistic side for anyone using them as an indicator of what they can expect to make in their first year. Factor in that the mortgage industry itself has forecasted a huge drop in refinance business in 2004, that a growing number of lenders are unwilling to pay traditional full fees, and that appraisers who are doing niche, non-mortgage work (divorces, foreclosures, estates, relocation, etc...) generally don't hire trainees, and the pie shrinks even further.
I can't imagine any intelligent person uprooting themselves in order to pursue the slim chance of getting a minimum wage job with absolutely no guarantees for the future.