Books are cheap, as little as free on a Kindle. I download lots of them, and I enjoy most of them. For the ones I don’t enjoy, I delete them as soon as they piss me off, but it would never occur to me to return them (yes, you can even return an eBook, for those who didn’t know) and ask for a refund, yet a lot of people do.
I recently bought a pricier hardback ($25), which I hated. The blurb was great and I loved the bit the author read at a signing, but the book stunk. A waste of $25, but it seems unethical to me to return something I bought, tried, and didn’t like, so I’ll donate it instead. Kindle sampling allows us to read chapters for free, usually enough to know if we’ll like the book. With prices as low as free, 99c, or $1.99, aren’t returns somewhat unethical?