Both of my big camelbacks, the Buffalo 20 and the Royersford 20, have similar stories. I was the only bidder, and the sellers didn't really care about the low selling price. They were glad that it was going to someone who knew what it was, and was going to restore it and use it.
My Royersford was in service in a decorative ironworking shop. The owner was semi-retiring and consolidating his operation into a smaller building. He had bought the Royersford from someone else around 1975, and had gotten 30+ years of good service from it. He listed it on ebay for $99 and I was the only bidder. He was really happy that I bought it, because he didn't feel right scrapping it. We talked for a while when I picked it up. After I finish restoring it, hopefully I'll get another 20+ years out of it and pass it on to someone else.