Here's some fun data on the various PHBs and the USA Today bestseller list.
3.0 PHB: three weeks in the top 150, peaked at #45.
3.5 PHB: two weeks in the top 150, peaked at #57.
4.0 PHB: four weeks in the top 150, peaked at #47.
4.0 PHB2: one week in the top 150, peaked at #28.
Oh, hey, MM and...