"In a recent issue of Japan's Famitsu Xbox magazine was an interview with Masaki Sakari of 5pb - who are currently porting over two very popular Cave top down shooters Dodonpachi Daioujou Black Label X and Ketsui X to the Xbox 360 as a retail product. In the interview Sakari has a short vent about why they went for a retail product:

"Our initial plan was to port lots of good arcade titles to XBLA. We talked to IP holders of these titles, and persuaded them. We secured these licenses, and fi..."