That’s exactly how I do it. I enjoy reading DRM-free epubs on my Kobo, and whenever I finished a book I enjoyed, I buy it from the local sci-fi bookshop. I buy about 90% of all books I read.

I used to do that with games back when I played. I was always a staunch advocate of, if it's good, people will pay, and I didn't want to be a hypocrite despite refusing to buy most games because they could not be returned afterwards. Even newer services that offer refunds make it more difficult than I'm willing to put up with. If I played it most of the way through, I bought it.

You have a SciFi bookshop? Where is it?