I bought a few enooks here till I realized where most of them are coming from. Public libraries. I found a link here that brought me a signup page to a prominent library. Signed up with a fictional address that was in the library's range. I get access to the same books, brand new releases and old, for free now. Most have no holds, you can download many different formats. And not be worried about malicious scripts that sometime accompany pirated enooks.
You are absolutely right, LC1007, with one exception: those public libraries normally don't carry specialized books like "Structured Oral Examination in Clinical Anaesthesia" etc.
Regarding bestsellers you are right: get into a library and have a life ))