I won’t pay more than $3.99 for an ebook either. If I want it that badly, I’ll buy a new paperback copy but I’m not willing to pay $9.99 for an ebook. I’ve seen some ebooks priced at $15.95! And that’s when the paperback version is in the $7.99-12.99 range!
That to me is total insanity.
I use my Kindle mostly for eARCs and the library, with the occasional purchased book if the price is right. It seems odd to some of my family that I’m willing to pay more for a physical book, but lots more work goes into print books.