In my order of preference I would put,
Geographical restriction (unless the UK starts being realistic, removes the tax and the unrealistic price difference that (often) means books are prices at $=£ !
No DRM or formatting/spelling mistakes.
DRM can be stripped;
mistakes can be corrected, but why should the purchaser have to do that; one doesn't buy a less expensive car whilst knowing that one of the wheels may fall off (no Toyota jokes please).
Price is an issue : lower than the equivalent pback. (though I admit ebook downloading is more convenient and cost-effective than a drive into town/or waiting on the post).
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