One of the things BookLamp is aiming to avoid is a popularity contest. While I sure wouldn't mind books being more widely popular, I disagree that BookLamp can be used to show authors what writing styles people like any more than just monitoring their sales like normal. The only difference is that, using BookLamp, it's more likely that new authors with books people haven't heard of will be discovered and read. It's not like there's some set formula to how to write books that will increase sales any more than there's just one style of music that you can expect every person to want to buy.
