As a correlary question: why do all lifting shoes look so fucking retarded? With that stupid strap and fucking insane colors? How about a shoe with a decent heel lift that is all black with no strap?
If I need them, I use old school Chuck Taylors, FTW!
Tarsal support is pretty important when you make the various catches, splits, and jerks in weightlifting, it helps combat that side blow out feeling you get with normal sneakers like a Chuck or a Adidas Samba.
As to the colors? Not a clue, but I bet it had to do with matching shoe to uniform color back in the old competition days, and just carried over. I personally like it.