I simply dislike their approach to this aspect of the business.  It forgoes the most practical option in favor of a system that favors a minority of people willing (and able) to spend piles of cash.  I'm sure Reaper would love to take a contract to manufacture the trademarked D&D beasties and NPCs, and it would certainly be nice to need three umber hulks and a mind flayer, buy three umber hulks and a mind flayer.  For people who prefer to paint their own pieces, it would be a godsend - no high priced resin collectors pieces, no low-detail plastic pieces.  The blind packs and collectors' pieces could coexist happily alongside them for those that prefer it.