Yakuza 4 Sees Highest Shipment in Series History:
http://www.andriasang.com/e/blog/2010/03/18/yakuza_4_shipments/
http://www.andriasang.com/e/blog/2010/03/18/yakuza_4_shipments/
Now in its fifth entry, Sega's Yakuza series shows no signs of slowing down. Yakuza 4 (yes, it's the fifth entry in the series -- the first PS3 entry, "Yakuza Kenzan," had no number), just released today, saw the highest initial shipment in series history. [No numbers ?]
...
He was also asked to share his impression of the launch. He said that his biggest impression was that younger players, of high school and college level, have increased. He feels that this is due both to the PS3 having expanded its age reach, and the Yakuza series having expanded its fanbase.