Music subscription models are often criticized for this . . .

Any chance of offering safari content up in an iTunes pay once and its yours model? Something like $20 for the book and $2 per chapter with no recurring subscription fee. I recognize the flexibility of the current buffet bookshelf model, but it doesn't seem to fit my wants/needs very well at the moment.

I've found a few very useful chapters but am not enthused about the entire content of some of the books. Yet with safari I've got to keep shelling out just to keep my bookmarks useable!