So an adventure based approach (like, say, the world's biggest current RPG) kills the possibility of an OGL (like what, say, the world's biggest current RPG is based on)? I don't get that thought at all. The rules become, if not a loss leader, but an adjunct to the adventures. SO being adventure based (i.e. that is where the money comes from) seems to make it better to have an OGL. Cheap/free rules for awesome adventures.
I don't think that posting a single post in Paizo's customer support form saying please cancel sub XYZ is any harder than clicking 'add sub to cart'. Different methods, sure, but harder? No way.