Kendo you're missing the point. We are blocked hits to our web sites coming from server farm ranges. These ranges have no reason to send requests to our web site servers other than to steal content, gather data for their own use, or to hack and inject malicious scripts.
Sure some websites hosted at server farms (i.e. Hurricane Electric and others) offer great services. But these sites have no business hitting our servers. Yes, there are a few beneficial bots that many of us allow... the rest we block.