For me it was the cost and the fact that it was the day after Gamesday - I guess my geek-fu is weak because Gamesday always takes it out of me
Till I get a raise at work or something $30 is about the point where I start questioning a gaming buy, with the exception of something like Battletech that is not only kinda special to me but also something I KNOW I will play again. DDMs is really only an excuse to get minis for RPGs to me. Hope that might help planning a little...