Ok, I'm guessing the reason is because then it would sell in stacks on AH, in which case people would be more apt to sell them as stacks on AH, if everyone has to buy 99 to get any it makes it worse off. However this is also foolish because I'm sure they don't have to make it sell in 99s, and also no one would buy in 99s unless they do nothing but VW all day long and have no stones...