Because it's an Xbox 360 exclusive, and you probably don't care about Xbox 360.

Project Sylpheed is not so hot, btw. (If you have a 360, you can download the demo off of Live.) However, I may buy it in the future when the release calender lightens up, because it's a 'cheaper' 360 game and I want to support more of the slightly obscure Japanese games that actually make it out to the US. Heck, I bought Earth Defense Force 2017 (loved it) and WarTech: Senko no Ronde (didn't like it) when they came out. On to older Japanese Xbox stuff, I snapped up Phantom Dust as soon as it came out, and that was definitely one of the last gen's hidden gems. The Otogi series was also one of my favourites.

I gave Project Sylpheed a temporary 'pass' because I didn't like the demo, and with Ace Combat 6 coming out (also a demo on Live) it just doesn't compare. Besides, there are folks who would pick it up just because Squenix is on the box. I'll let the sheep do their thing.

Note--it's not an RPG. It's a space flight shooter.