Again, comparisons to MtG don't really follow. Part of the hobby of playing MtG is the fact that you have randomized packs of cards with which you build your deck. Randomized packs are the POINT of the game. The fact that you cannot (at least without buying from other markets) go out and buy your deck is exactly why they have randomized packs.
But a randomized pack isn't what virtual minis are about at all. We don't buy minis to play with the minis. We buy minis to play D&D. We buy cards in MtG to play with those cards. It's a totally different market. You don't go out, buy random minis, and then build and adventure around those minis. Minis are 100% secondary.