Live and learn. We NEVER block a buyer until at least 60 days have elapsed from the date of his last purchase UNLESS he has perpetrated fraud. After 60 days, he cannot leave feedback.
But we try to screen potential buyers BEFORE they order. Many backbreaking buyers almost always message us prior to placing an order. This works to our advantage because we can check their feedback left for others. If they have left negs for multiple reputable sellers, we block them. Or if they make a $500 offer for a $2,000 coin that is worth $1,600 wholesale, we block them. Or if they seem unreasonable in another way, we block them.
But some backbreakers will just order without contacting you first. You will then need to endure their abuse until you can block them without fear of receiving a retaliatory neg as explained above.
But even if you block someone, he can still order through another account. You may want to message anyone whom you have just blocked with a warning that you will not accept any future orders from him from any of his accounts. If he sneaks in an order anyway, cancel it and have Ebay remove any retaliatory negs that the may leave.
