This will be a hotly debatable subject for years to come. Personally, I like the idea, but the cost is just ridiculous. For the 12 issues announced thus far (until the end of March that is!), one needs to shell out $979.96 for a complete set of uncut imperf press sheets. The whole year 2013 will probably cost in excess of $2.5k...
I think USPS should make these available in single panes at least to keep the cost at a minimum for collectors. But if no one complains, they won't change anything.
Some of the previous issues have achieved significant premiums - Baseball All-Stars mixed pane, Earthscape issue. But the rest can be bought for a reasonable premium on
ebay - and as single panes or stamps!
At the end of the day, USPS is a business not a charity. They know that at least 99% of imperf stamp press sheets will NOT be used for postage. That's the best thing that can happen to them...