It all depends on what you sell. In my line I am likely to see a lot of similar items to a new buyer. A lot of people don't take bidding on ebay seriously. I have a lot of items sold to one buyer and then no payment. I do block a lot of people but have no way of knowing which new person will pay. For me paypal is better. I won't buy from someone who doesn't take it because it offers you protection that the item will be sent to you.