Oh, I don't seriously expect to actually try to sell my plot. As I was discussing with lalunatique, the whole thing with keeping the actual product a secret pretty much mandates that the seller has a really well-regarded brand name. People might be skeptical of my selling a plot, rightfully, while Stephen King could probably sell one easily, since he's a pro with a huge record of success, and people familiar with his works can get an idea of his "product style" from having read his works.

I'd love to come up with a way to market the idea without such secrecy, but I just don't trust people enough. It could be that I'm overly paranoid, though.