Well, specifically, the sole is sloped and we can't see the inside. Also, we don't know how thick, flexible, or grippy the sole is. We also don't know the weight, the thickness / stiffness of the material, etc. Someone could clearly bust out some moves in them, but I can hit moves in Dr. Marten boots, so, that's not saying much.
and, as a general comment - at one of the Funtastik tournaments (03 probably) I went to the cheapo shoe store down the street from Sunshine Park, and bought (not one, but) two pair of US Polo Association brand laver look-alikes! Structurally, they looked exactly the same, and they were only $30 each, so I thought, what the hell, let's give 'em a try!
Turns out the sole was heavier, stiffer, and slipperier than the laver, so, even though it looked like a great footbag shoe, it turned out to be not nearly as good (and even dangerous; that's how slippery they were) when compared to the laver.
So, now my general policy is that looks can be deceiving. I think it's also good for beginners to go with something "tried and true" before getting themselves into what could be a very frustrating experiment. We all know that the last thing a beginning footbagger needs is more frustration.
so that's why.
and thanks.