KDP select means
a) my books would be available solely on Amazon.
b) my books could be borrowed and royalties paid on a pages-read basis.
(a) is a disadvantage, but I switched Black Dog to KDP select in order to make it free for five days back in December. And you know what? (b) is very decidedly making up for (a). Sales through all other channels have never been at all high. Pages-read in January and February was a lot more noticeable in terms of income.
I know I have one reader who comments here who buys from Kobo. No doubt there are a scattering of others. But … those pages-read royalties are definitely something to think about.
Comment, please. How many of you would even notice if I switched everything to Amazon exclusively?