>Then maybe you want to get rid of the link on the page that asks people to make an offer.
If I was them, I wouldn't want to get rid of it at all. Why would they? It's not like there's a big "FOR SALE" banner - it's a tiny little link in the corner that doesn't even say anything about selling the site. You have to click through to get to the e-tracker site.
Let's be realistic, here - every website is for sale if the price is right (even if the price is $44 billion for Yahoo!). Just because the owner of a given site is not actively pushing to sell something doesn't mean they wouldn't be interested in hearing people's reasonable offers, and getting a sense of what the market value is. That's good information to have.