Because they are primarily made to be used on boats. With wheels they would be more prone to moving around on whatever platform you have it sitting on. Factor in the fact that these are also made to stand/sit on, they dont want them to be able to move too easily...
My igloo has wheels. It holds enough ice to keep my beer cold for the amount of time it takes me to drink my beer, though I'm not sure how many pounds that is.
http://coolest.com/ -- I chose this over a few ice cubes not melting as fast.
They need to make a camo one with a cushion top for dove hunting. That'd make for a hunt to remember
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