So what you are saying it you made the ePub not as good as it could be because Mobipocket cannot handle floating images? Please don't do that.
Ahem. So what you are saying is that authors should ignore 90% of the market in order to cater for the lucky 10%? Please don't do that.
I found a way to achieve results for all users... not ideal, but perfectly acceptable. Books are products just like any others, and market penetration is paramount.