I'm a little baffled by the DDM product line.
I get that it was designed to be a competitive game and the rarity system works well for that. This structure makes limited environments interesting, drives sells for those wanting rare minis, and helps the after market thrive on chase rares. It worked brilliantly for Magic the Gathering.
However, magic isn't a dual use item like DDM (unless you count putting them in your bike wheels to make noise). The minis game may be the greatest thing since sliced bread, but I've got little interest in it. I am interested in getting goblins, kobolds, dragons, horses, drow, and a variety of other minis for my DnD game. I'm very much baffled by WotC's inability or unwillingness to meet this desire. I don't care what goblins are in the goblin pack, I care that they are goblins. Likewise for the Lizardfolk, drow, magical beast, etc.
Give me miniature theme packs and I'll snatch them up!