Let me pile on..
No DRM, buy, download direct to my PC, done.
If I'm going to pay money for it, I insist on being able to download a physical copy that I can make backups for and put on my own devices.
I am tired of this proprietary app/software crap.
There are plenty of sites that are doing it correctly: Smashwords, Book View Cafe, Robot Trading Company, Peter David's website, Tobias Buckell's website, etc.