This experiment would be worth it if only to see whether the writing process is more akin to your blueprint metaphor or my quantum-engine-that-turns-car-door-purple metaphor. XD I guess a lot would depend on the context, how detailed and technical the story frame is, and more.

A few questions: What kinds of buyers are you envisioning? Aspiring professionals who don't know where to get started on their big break, hobbyists looking to save some time, washed-out pros who want to break out of their ruts, writing educators? Is full confidentiality guaranteed, since in an ownership-obsessed culture there could be repercussions for using pre-made plot in professional work? Also, would you disclaim all possible intellectual property claims and make each product a one-sale deal, or do you hold onto some legal rights on the work such as resale rights?