This site has a PR7, inside pages have huge page rank (
PR 6), Forum is highly active, backlinks galore (as you say). This is a legitimate site, full of information, and if I were webmaster I would just chuckle at any request to buy this domain... unless there was serious money on the table.
Naturally it does well on Google because it is probably the prevelant website on the Internet for this topic... and would kick butt if they did some more work on their
SEO.
Don't lose any sleep over this one... forget about it.