I think Amazon should allow uploaders to indicate that a book is unsuitable for mobi-only readers. That way, in the case of advanced formatting, the book would show up as incompatible with their older device (if they have one).
I agree that there may not be enough left out there to warrant the extra work, but I also don't like the idea of leaving paying customers in the lurch either. If someone CAN buy your book for their mobi-only device, a part of me believes there's an obligation to make sure it works adequately on that device (though Amazon's generous return policy does mitigate that obligation a bit).
Allowing content providers to flag their products as "not suitable for K1, K2, DX" would be ideal I think, but alas... that's probably not in the cards.
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