Paul, I believe there is a legitimate need for a screening assignment, kind of like a level 1 environmental assessment. The client might be the loan officer. The reverse mortgage guys are forever looking at zillow, assessor valuation, etc, but have been flying ever more blind as they have discovered old rules of thumb like assessed value being the likely low end, are now out the window.
The SOW could be to develop a probable range of value for the LO to decide on work priorities, product selection, loan pricing, etc. The fee should stand on it's own. If the appraiser is indifferent as to whether to do restricted use desk top appraisals all day long as opposed to 1004, it would be hard for a witch hunter to make the case that there is contingent compensation. Heck, the 1004 stage might lower the profit. The SOW change for report 2, it should be pointed out to the client, means the results are only predictive and the EA covering interior condition makes it clear that there is no guaranteed result, only an improved likeliness that the result will fall within a range identified by the screening assignment. For all the appraiser knows, more money down is possible, etc.
Paul, there is one small problem in MN, if this involves a contemplated desk top assignment. Somewhere in the MN rules, it requires inspection inside and out, of property improvements. I have posted the relevant section before and can do so again, if asked. Bummer, all of those 2055's, exterior only. I know I did a few in the '90's-almost fell out of my chair when I read the MN rules carefully. That part should be deleted, IMO, but, so far, it has survived.