Originally posted by DogLover A good deal is a two-sided coin. Price ain't the only factor.
Exactly.
I love a good deal as much as the next guy (perhaps even more than the next guy), but a good deal isn't just about price, especially when it comes to buying a used body.
Now, for full disclosure, I bought a used K-5 body a few months back at a pretty good price (around $1100 when new bodies were still about $1450). However, it was from a reputable used camera store from which I had bought over a dozens things from in the past. They also have a 100% money back refund policy should there be any issues. So while there was an element of risk to my decision to buy a used K-5, the risk was substantially less than the situation you've described.
As it turns out, the K-5 I ended up with was a fully inspected (by Pentax) replacement for a previous body that had issues. I guess while the original owner was waiting for his replacement from Pentax, he decided to switch systems and then traded in the replacement K-5 for other gear. I got somewhat lucky the way it all worked out, but I am still accepting some level of risk as I am not covered under any kind of warranty right now