We've had one like this before. So far the bidding is low but it still has nearly three days to run so it may go up.
All you get for your money is the site, one month's hosting and a list of contacts.
You pay for the domain registration and subsequent hosting so you could do that for a domain of your own choosing with a host of your own choosing.
The site looks as though it is based on OsCommerce, which is an Open Source e-commerce package, so you could create a similar site yourself. It's is riddled with spelling mistakes (they spell "Categories" incorrectly even though OsC spells it for them on one page!) so you'll have to do a lot of work on it anyway. Some of the information pages need a rewrite ("un-paying buyers"!) too.
The site was created on 07 November 2003 so why is it already for sale? If it is such a money spinner why do they want rid of it?
You can get a list of contacts from trade magazines which you can buy for a few pounds at WHS.
If the bidding doesn't go much higher it *might* just be worth it to save you some groundwork but personally I think that you'd be better off saving your money, getting down to WHS for a trade mag.and then downloading OsCommerce: