Thrift Auction: Early Paul Pyle Dulcimer with Tail Damage
Instruments- discuss specific features, luthiers, instrument problems & questions
I agree with Ken that it is good to have posts which include information about historic dulcimers and builders.
Along that line, perhaps the one you first pointed out you might have noted that it was a J. C. Shellnutt instrument. He is arguably important because he was one of the first California revival period "manufacturers."
He originated (I think) a head design which migrated to a flood of Korean instruments sold under several names in the 1960s and 70s. It is great for cutting costs, but has too much friction in the tuners and went out of fashion before 1990 or so.
On the Pyle instrument you have cited some good cautionary advice. That was good.
I just think that you should not speculate on price, and should be very careful about suggesting suitability for beginning players or collectors.

It has a screen door handle on one side so it doesn't need a case