http://pages.ebay.com/help/policies/...me-buying.html
As a buyer, you're not allowed to bid on or buy an item in order to harm a listing or to leave negative or neutral Feedback or low detailed seller ratings for sellers.
Make sure you follow these guidelines. If you don't, your account may be subject to a range of actions, including limits of your buying and selling privileges and suspension of your account.
What are the guidelines?
Not allowed
You can't buy with the intent to disrupt a listing.
Here are some examples:
• You can't place a bid that greatly exceeds the value of the item in order to prevent a sale.
• You can't bid on multiple items listed by a seller unless you intend to buy all of the items.
• You can't try to buy or bid on an item if you're on a seller's blocked bidder or buyer list.
• You can't use another account to buy or bid on an item if you're on a seller's blocked bidder or buyer list.
As a seller, you can report a buyer *who bids on a listing without meeting the listing terms
Preventing unwelcome buying
As a seller, there are several things you can do to prevent unwelcome buying including:
• Specify buyer requirements to block buyers who don't meet certain criteria.
• Require immediate payment on listings with Buy It Now.
• Block specific bidders and buyers.
• Cancel bids.
• Report a buyer to eBay.
http://pages.ebay.com/help/policies/...me-buying.html
My note: If the buyer happens to be from Alaska or Hawaii, you can block all buyers from those States just in case he has sockpuppet people coming after you. Could be a competitor