Using old browser platforms.

Okay, I have a huge pet peeve! Why in the world would anyone not update their web browser?? It's fast and FREE. Who would choose to keep an old - outdated browser? As a web designer I am not fond of Internet Explorer to begin with. Yes, IE7 has made progress, but they have a long way to go! Firefox renders properly and is totally up to speed. I know that I am supposed to work like hell to make my designs cross-browser compatible, but why should I have to continue to do this. Honestly, if someone is still stuck with IE5 I don't care how their web page looks. That may sound rude, but I will not cater to those that can not keep current with simple technology. I am starting to feel this way about IE6 users too! I would love to hear how everyone feels about this!