I hear this all the time. Let me answer this graphically:
No! As a complete unknown, the ability of readers to try my books at no additional cost has tripled–or more–my sales. I mean, can it really be a coincidence that the start of the KULL program just accidentally happened at the same time as that leap in sales?
If you are a well known writer with huge sales numbers, perhaps it’s different. Of course, you’re probably not reading this blog either, but . . .