I don't see ANY upside to buying Vista now. I have a stable system that performs well and is fully matured through all its service pack incarnations. So now you want me buy Vista and jump through all those hoops again?...I don't think so.
But what will you do when they stop sporting your current version of windows?
To keep up-to-date with the latest, you are stuck with buying the latest … Gates needs to buy toilet paper for his multimillion dollar home after all.