We are being rather harsh with Bethesda. They did claim that there would be fewer expansions to the game, and (more or less) small stuff would be given for free, and they have followed up on that promise so far.
The house building may have warranted enough work to charge for it, but it also serves one key role for anyone not on the X-Box 360. It will fulfill the terms of their contract with Microsoft on a rather minor note. Leaving the later (and hopefully more satisfying) add-on's to be released for everyone at once.
What if this is an attempt to punish us now to please us later?