I say, go for it. It's not a waste, even if you don't fint a publisher. For one thing, the mere act of writing forces you to organize your thinking, which helps you to clarify what you're doing. For another, you've got a very interesting idea going. I'd love to see how it turns out. I'm sure many others agree. I think what would be a waste is to give up after already investing so much effort into this.

If you get that book published, I'll buy a copy. So that's one sale already...