Well it was a doujin store, so it made sense. Touhou stuff, doujin music and games, and 2ch stuff specifically.
The silly thing is that I ended up paying 1350 yen for it at the store, but then I went to a small Touhou doujin event later on that day to see some friends, and Unlucky Morpheus was there selling their CDs, including the new one I just bought... for 1000 yen. I took the chance to buy their first one at least.