Not meaning to jump into anyone's fray here, but ...
FWIW, I am fully aware that when I purchase an ebook I'm really renting it, since the format will probably change in the next few years. Guess what? That's OK with me. Any book I want to have "forever", I buy a paper copy (aka "collectible").
Otherwise I just assume I will be buying it in a different format someday. Or (gasp!) not buying it again at all! Who knows what my tastes in books will be 5 years from now? Last year I was into all the hot new knitting books; this year you couldn't pay me to reread (much less repurchase) one of them, in any format.
Life is like that. Things always change. Just roll with it.
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