it actually sold really well once they dropped the price to 1499, which was pretty much on-par with the pricejapan type sites at the time. it may have even been slightly less
currently they are 1425 on pricejapan, and massdrop acquiring pairs to sell at 1299 indicates someone is sitting on stock and can't move it. i haven't been able to sell a TH-900 since last october, prior to that it was 2 or 3 per month.
i'm not sure if Massdrop is for people who will buy anything because it's on sale or if its for people who really want the TH-900 at a slightly lower price. a 15% discount shouldnt result in something flying off the shelves