Have you tried a pair on? Then you will understand . They are not only comfortable but they are really warm. I work outside everyday for several hours, and when you are on your feet all the time and it is five below zero something that is comfortable and warm is just what you need. I really seem to enjoy them. Uggs are pretty sweet. Plus they aren't too heavy, so they don't weigh me down.
Because they just are!! Uggs are without a doubt the comfiest (sp?) shoe ever made. I myself am not a fan of clogs, but Uggs are amazing! And so stylish!