Update: In Brad's latest interview on GC2 beta, given to CG Online. He stated that they sold 120K units retail. But he also states that GC1 is earning 6 digits of money annually purely from online sales. That sounds like online has more units sold then retail to me, but that's just a wild guess on my part.
He also mentions that GC2 will be easier to find on retail shelves when it goes production, versus GC1.
I still think they should let the "how to win in 555 keypresses" be a seperate guide. But now I wonder how complex the basic info should be and should include, if the primary method of distribution is going to be retail CD/DVD for the first year.