As long as the block lasts not more than a few days, as he says in a nearby comment, I don't think it's much of a problem.

Oh, believe me they only last a few days at most. I don't use an infinite IP blocklist. It has like 100 IP's or so. When one goes in, one must come out. And lets just say there are enough badly behaved bots around that it doesn't take much time for 100 IP's to rotate.

"But satisfaction brought him back."