Location is a big part of it. We had a plumber come in a few days ago and when he saw all the sewing machines laying around he told us his wife just bought a multi thousand $$$$$$$$ Bernina. He also said that she had been looking for a treadle machine, but couldn't find one. In some areas they are all but extinct. I have 5 with a 6th under repair and I'll buy and refurb them any time I can. There will come a day that even the run of the mill treadles will be hard to find. I've seen it happen in other venues.
Joe