Antique dealers seem to be only partially in this world and partially in some other reality...
I was in a local antique store and saw a BEAUTIFUL New Home treadle. I asked about the price and was told $675!!!
I grabbed my phone, opened my nationwide CL search tool and showed them 10 ads with the same machine in approximately the same condition, all listed for more then 2 months and at less than $300... I asked if they were willing to reconsider, and was told "Nope, I think this price is appropriate and it will sell for that price"
Two months later, it is still there...