A seller An eBay user doesn’t ban another user. You can block an ID from bidding on your items but it’s impossible to stop the person from bidding with a different account. Unless both accounts are registered with the same name, address, email, pay-pal etc. you can't convince eBay support that it’s the same person. I looked and there is nothing in their blocked bidder policy that states what action would be taken against a user who attempts to circumvent a block. I don't think they would suspend an account they would probably just “educate” the buyer. More than likely if someone buys something and leaves a negative the seller wouldn't even make the connection to someone they blocked and if they did it would be difficult to prove. If you block an ID just because someone asked too many questions then you have no idea who it is. If you have a real problem with someone by all means block them but I wouldn't recommend annoying people on ebay for no good reason.