When the laughing stops the Realtor may come to the realization
Then ask the Realtor for your adjustments!
I think you may want to broaden your perspective on appraising. Comparable DOES NOT mean that the same buyer may be interested in it...
I have traveled several counties for residential comparable sales. Some times, comparable (not competing, two different things) properties simply do not exist in the same market area as the subject. I've appraised houses on islands. Try to find 3 sales within 1 mile and conform to FNMA guidelines.
Similar, competing market...... 50 miles away. Yeah, right. Support that adjustment or lack thereof.
Re-read my post. I NEVER said competing. Those are your words.
Support the adjustments? Quite easy to do. There is no need to do a matched pair analysis between the two. I understand your experience may not have afforded you the opportunity to appraise complex properties, (and I do not say that condescendingly), but if you can locate a community 100 miles away, and it can be shown with reasonable degree of confidence that property values are similar, LTV ratios are similar, there is no reason you could not select a comparable (NOT competing sale) from that subdivision, and have NO adjustments!!! Nothing to prove there adjustment wise.
I have gone out of state for comparables on historic homes. Do you realize that when doing commercial appraisals, in is not inconceivable that an appraiser would go half way across the country for a comparable, and I've read appraisals of sky scrapers where the appraiser has gone to different countries for comparables...
The important thing to remember is that
a property does not have to be COMPETITIVE with the subject to be COMPARABLE to the subject. Now ideally, it would be preferred to be close and competitive, but this is not a perfect world, thus the OP's conundrum.