For that matter, it's not often you see a Winblows system with over 49 days of uptime tho I have had mine go over 9 weeks ;-)

Probably because most people who run desktop computers (the bulk of Windows users) don't want to run up their electric light bills to prove a point. Money doesn't matter to me which is why I can successfully run one particular machine that has a nice quiet power supply for months on end. This machine runs IIS, Photoshop, umpteen browsers and WS FTP (web development purposes) and also hosts a mIRC bot I run. If you have problems with stability then it's a reflection on you, not your computer.