Authorial Stickiness and Self Publishing

I've been buying and reading a number of self published books of late, primarily because of the price point of $.99.  I find that the $.99 price point overcomes a lot of reservations I might have about a book.  One thing I did notice, as I was going through my purchases, is that I don't have a lot of repetitive authors I've purchased at $.99.

I wondered what other readers were doing and what kind of stickiness these self published authors were having for readers.  The $.99 price point is a...