Hi,
Look all surveys and studies in the field of what writers earn are flawed. This one is no exception.
But Brian using indie and self publishing interchangeably is not really an issue here. They are fairly much the same thing. By indie we aren't talking about smaller professional publishers we are talking self publishers. And so no you can't assume an indipendant publisher has quality controls in place. What you can assume here is that in the sample analysed quality controls are in place simply because these are the top 2,500 books in each genre not the bottom.
And I'm not even going to worry about the stars and customer preferences. That's a red herring. If an indie book is well done no one should know it's indie.
I'm only going to look at the incomes of authors - and here he's on to something. But with an obvious proviso.
The study begins by starting with a skewed distribution, only looking at the top 2,500 books in a number of selected genres. That means that you have to assess the findings against the population studied. And the population is moderately successful and above authors not all authors. For that group it holds water.
What this study clearly shows is that if you as an indie can make a decent fist of making a decent book with proper cover, blurb, marketing and a moderately desirable story etc, then you will probably earn more than a comparable trade published author.
That's actually no great surprise. (And I know many trade published authors won't want to accept that.) But in the end it's simple maths really.
If I as an indie can put out six books in a year at say four bucks, and a trade pubbed author can only put out one because of the road blocks inherent in the trade publishing industry, then I'm already on a six to one advantage. Then throw in the fact that 70% of that four bucks is mine and our trade published guy gets say 15% and my financial advantage grows to roughyl twenty five to one.
The trade published author then has to make up his dollars in terms of having a solid publisher behind him allowing him to charge more for his book - say eight bucks, and then by them selling more books. So lets say I sell a thousand of each of my books and earn $2,800. That's $16,800 to me. To equal my income our trade published author with his single book has to sell 14,000 copies. That's not an inconsiderable number. Some will do it and some won't.
Average incomes for indies will of course still plummet further than for the trade published because there are a great number of poorly prepared books out there which never sell anything at all bringing the overall numbers down. (But they aren't a part of this study.) So for those who can't be bothered producing their best work they won't get a lot out of this. They'll fairly much earn nothing self publishing and they won't be able to trade publish either so there's really not a lot in it for them either way.
What each author has to decide for him or herself, is whether they believe that the advantages of trade publishing, i.e. more sale chanels and higher prices, not to mention in house professional cover design and editing outweigh the advantages of indie publishing, i.e. just being able to publish books. If you are able to produce a good book, cover, blurb, market etc, then I would suggest that in most cases you would be financially better off going indie. If on the other hand your skills in some areas like covers and marketing fall short and you don't want to spend the time and effort upskilling but rather just writing more books, than trade is the better option - assuming you can find an agent and publisher.
The one thing that is certain however is that no matter which road you take quality must be your byword.
Cheers, Greg.