Berofe you think the issues are, I recommend you review three things.

The first is an overview of the economics of framework development which is excellentlt covered in the February '98 issue of Software Development magazine.

The second is an article titled Leveragong Object-Oriented Frameworks at http://www.taligent.com

The third is a paper called Evolving Frameworks - A Pattern Language for Developing Object-Oriented Frameworks at http://st-www.cs.uiuc.edu/users/droberts/evolve.html.

The issue is deeper than you imagine, I suspect.