Which is considerably more work than simply clicking "Buy now" and turn on your WiFi-Connection (if it isn't already active).
Actually, it's only very slightly more work. if you plan on keeping a copy of your eBooks, then it's even less work.
All you do is put the eBook in Calibre, DRM stripped. then plug in the reader to the computer, transfer the eBook to the reader and done. It may take longer, but the actual effort involved is not much more and when you are done, the benefits outweigh any extra effort. And you've paid $2.03 less this way unless you go via iBooks in which case, you've paid $3.46 more.
If you want to pay more for the ever so slightly more convenience with a lot less benefit, feel free. I think it's silly.