[Patty Jansen]

If you're talking about those Facebook circlejerk groups where every member is an author and you're just shouting in the void, I agree it is a concern, and you're probably wasting your time being in those groups, but Bookbub has a database of millions and a proven record that actually *moves* books. I'd say there are thousands of other things you'd need to worry about before worrying about how many authors there are on Bookbub. Their system works and they sell bucketloads of books.