Perhaps my question might be better phrased, is he in the majority?
I suppose so, but only because a majority of coin dealers aren't ancient coin experts. Go to a typical coin show and you will find 95 modern coin dealers to 5 dedicated ancient coin dealers. Actually, the numbers may be more lopsided than that, but you get my point. Going back to my original metaphor, you would not sell your Rembrandt to a print shop; rather, you would go to a fine art dealer/auction house. Similarly, you would not sell your ancient coins to the majority of dealers that know nothing about ancient coins; you would offer them to one or more of the many, expert, dedicated ancient coin dealers.
Yeah I guess that sums it up Carausius. Building a relationship and getting to know the major ancient coin dealers and auctions houses will be the way to go.
And Bill, I keep every single receipt or the best transaction records for all of my purchases because even with my 19th century collection, their is fascination and often premiums associated with provenance.