I love that idea, in theory. In practice, it would mean I'd never share non-standard playbooks with anyone, as my play is almost entirely limited to my own local group, and I'm the only one who loves RPGs enough to actually buy the darned things. :)
I mean, I get why you wouldn't want to just post them all publicly for everyone to have (I don't agree with it, but I get it), but there's more middle ground to be explored yet.