It's amazing how much (poor) marketing has to do with a game's sales. The same thing happened with the original Valkyria Chronicles on PS3. They made a great game that received very good reviews and then no one bought it. The hype machine is a real thing. People need to hear other people, websites, and commercials talking about a game in order for publishers to sell lots of copies. Otherwise they will just wait and buy it for $20 eventually.
Sega is making fantastic games now and we all wait until they are $20 to buy them. I think the bottom is going to fall out again.
Conversely, look at Atlus games. People buy them early so they can play them right away and be a part of the water cooler conversation.