I'll make this one short:
On my Readings page, I use a WordPress plugin that allows me to show off the books that I've read. At the moment, I'm pulling my data from OpenLibrary.org (an Internet Archive project). The last book that I read had no cover listed, and one of the other covers was smaller than the rest. Because it's a community data source, I was able to register for an account and upload cover images. Instant fix! Not only is it fixed for me, but it's fixed for anyone else who uses data about those books from OpenLibrary. I think it's really cool that I'm able to go "fix the data." That's something I could have never done if I was pulling the metadata and cover images from Amazon or another closed source.
I feel empowered.