I don't think we have yet fully figured out reasonable return in e-music or literature - though music is close. I do not know any musicians, but I do know a few people who earn their living with a typewrit ....... uh computer keyboard. Novels and popular history, can create additional sustained e-income for the author once the initial print edition has had its run. But it is rare (as in Clive Cussler sort of rare) where the download scale exceeds the initial printed return. It would be particularly true of a obscure subject like fine rifles where scale of download interest would likely never exceed the value of the print run.
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