@booksnmusic
Authors could use the response data to learn people's favorite genre's or preferred length, amount or type of sex scene, etc. It would help me craft stories that more people like.
It takes only a little time examining the various 'top' lists found linked on the home page to certain the most popular types of story subject.
Will following the popular story types guarantee you a larger readership? No. It won't, authors would write about the things that interest them, however narrow or wide that focus is, are most often those who produce well written work worth reading. Some are popular in the lists, others are less so because their focus isn't the most popular.
Most authors would like their stories read more, but few would sell out just to chase the popular theme of the moment. We are after all talking of stories posted for free, read for free, there is no commercial drive to increase sales.
Some of us even appreciate that our favourite authors would never get published because of the subject or content of their stories, it makes them no less as authors, just appreciated by those who follow them.