Unwelcome and malicious buying policy
As a seller, you can block bidders and buyers any time before a listing ends, and you can cancel unwelcome bids. After you cancel a bid, you can add the bidder's user ID to your blocked list to prevent them from bidding again.
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 the seller.
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?
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 without intending to buy that item.
You can't bid on multiple items listed by a seller unless you intend to buy all of the items.
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.
Important: Buyers who don't respond or don't pay for items are violating the unpaid item policy, not the unwelcome buying policy.
Preventing unwelcome buying
As a seller, there are several things you can do to prevent unwelcome buying including:
Why does eBay have this policy?
When a buyer bids on a listing with the intent to harm the seller, it costs the seller time and money. This policy helps create a safer and more successful buying and selling experience for all eBay members.