You would need TWO BIDDERS to get a bid up to, say 10,000, to stuff the seller. Otherwise the one bid, no matter how high it is, would only go as high as it needs to go to actually win the bid.
Anyhow, to complain to eBay, there is the eBay "Community Watch" page to do it from:
http://pages.ebay.co.uk/help/contact_inline/index.html
I would guess it is a
"Report a prohibited item or listing policy violation"
then
"Possible fraudulent listing"
then
"I didn't bid but I think a listing is fraudulent"
Hit "Continue"
then under the heading of "Contact Support"
Click on "E-Mail"
NB. Please allow up to 24 hours for a response.
In many cases, you will receive a response sooner.
Good Luck in shutting him down.
PS. eBay Rules and Policies and the list of violations are here:
http://pages.ebay.co.uk/help/community/index.html
Importantly NOTE:
They also say:-
Please note that the above list is neither exhaustive nor restrictive. eBay reserves the right to delete any listing that may violate any legal provision or the general principles and values of the eBay community, even if the legal provision or principles and values are not explicitly stated on the site.