I got my first kindle in 2010 and bounced over to Barnes & Noble for a while with a Nook but then came back to the Amazon ecosystem. I've bought hundreds of books over the years.
But just like paper books there are a lot of books that I read once and never look at again. They aren't priceless treasured objects for me.
The thing with Amazon.. people complain a lot, but their ecosystem just works the best in the eBook space. I actually find it a lot less annoying than some of the shenanigans with other digital stores like the iTunes store over the years. I haven't tried Kobo but B&N was always a hot mess compared to Amazon. Tons of annoyances in the store & device software that Amazon had right from day 1. And you were paying more for a worse experience.