I no longer agree with that. People who run older browsers are used to what they get and know they are running old stuff. I only support current versions of browsers and the previous versions. I've not had one complaint.
I deal with web apps and most of the things I create wouldn't run in those browsers anyway and no one is going to pay me the extra time to deal with it either. In fact, I've started charging a 30% premium for those wanting IE6 support but no one has ever asked me to do it either.