Yoshida claims Sony doesn't know why PS4 is selling so well.

[QuintonMcLeod]

This is a perplexing situation Sony is in. No one knows why the PS4 is selling so well. The software certainly isn't why, otherwise the PS4 attachment rates would be higher. The highest selling game is COD at 2.5 million copies. Meanwhile, the PS4 has sold roughly 10 million units.