{oops! I posted this in the wrong thread earlier, meant it to go here.}
One thing I notice about these auctions. Also on Craig's List. And eBay.
About 80% to 90% of what is for sale is Nikon, Canon, Minolta, Kodak, etc. Very little Pentax.
I would venture to say that is because Pentax cameras and lenses are the very best, and once well informed photographers get their hands on them, they are smart enough to not let go of them.
Sure, one might argue that because there are fewer Pentax items sold each year then there will be fewer available for sale used.
Believe what you wish.
However I will choose the former idea.