Lots of authors go indie for different reasons: some good, some bad.
It's one of the things which make indie books so frustrating - because it really is a crap shoot and the range is so much greater than in commercially published works. Indie writers, and readers, can take more chances - and sometimes it pays off tremendously well, and sometimes it fails tragically.
Their reasons are as individual as their books - you can never say why indie authors go that route, but only why one specific author went that route.
I'll admit that the indie books I'm most likely to buy are author reissues of commercially published books that have since reverted, but that shouldn't surprise anyone. The single most common reason for buying any book is that the purchaser had read another book by the same author and liked it.
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