>Amazon keeps suggesting yaoi manga after yaoi manga to me.

I know that Amazon isn't the basis for your entire argument, but it's difficult to trust Amazon recommendations as an indicator of the market. They've made targeted marketing into an art form. If you buy one book about frisbee golf, you're going to be recommended pretty much every other frisbee golf book out there.

I know Anna's said it many times before: Amazon sales are usually a very tiny part of the market.