Mcintosh pre amp pricing

I'm looking for a used c53, then adjusted to bing open to a used c52, now looking for even a c50- older and older units- yet- the asking prices and inflexibility of the sellers is insane. People asking for 80% of MSRP for 5 year old units, close to the same for ten year old units- the difference in msrp and technology across these three models is huge yet sellers of ten year old c50's are asking for what they listed for a decade ago???

Sellers with no selling history demanding PayPal Friends and Family  so the buyer has no purchase coverage.

These models are nice but they ain't worth anywhere near what people are trying get for them in my opinion.