DeeCee I agree with you. I have been a bot hunter for some 10 years now, it's like a sport, and no bot enters my sites unless I let it in.
The case with Bing on this particular site is that their bot aggravates me. Asking more times for robots.txt than pages and sending too many non-Bingbot UAs (which I treat like any other rogue bot) will not get this site indexed and consequently get visitors from Bing.
Therefore blocking their bot all together makes me feel better and that's worth something too ;o)