I subscribe what you said, Jason, but there could be a reason why GSG should be free: help people start with IBO in the evaluation stage. When I started using IBO I was strongly convinced it was the right way because I already broke my head against standard VCL controls and I've read lots of good comments about IBO in the newsgroups.
It's not hard to belive to me that a "less pre-convinced" programmer could easely give up with IBO in the first stage if he can not have a tutorial like GSG, possibli in a printable format (I've used an utility to convert it from hlp to rtf, a program called "helpdeco").
I'm sure a Advanced Topic Tutorial will undoubtedly something to pay for ;)
Regards
Marco Menardi