Just a lot of effort involved to save two dollars on an e-book that I can download directly to the Kindle.
If you are setup properly to strip DRM, stripping the DRM takes as much time as it takes to load an eBook into Calibre. Then all you do is send it to the Kindle and it gets converted along the way. Not a lot of effort or a lot of time.
Download eBook. Copy to Calibre (which has the DRM removal plugins already installed). Plug the USB cord into the Kindle. Send the eBook to the Kindle and it gets converted along the way. Eject the Kindle. DONE!