If I can pick up cheap, pre-painted minis when I need to have them and get what I need, then I am all for it. If the packs are cheap enough, I suppose I would be willing to pay the markup of buying singles. However, I am not going to buy a whole cartload of boosters just to get those minis that I need. WOTC needs to realize that they will get ten times the sales if people can pick them up who will never play the miniatures game. I know I buy stuff produced for Warhammer because I can get a legion of skeletons really cheap, but I have no interest in Warhammer.
Instead of random boosters, who here wouldn't get behind a box of 20 kobolds, for instance? Imagine it as 3 each of 6 different looks, one "wizard" and one "cleric". I would buy each set that came out for each race! Hey WOTC, this is what I actually WANT!