I definitely have new tires balanced when mounted. The times when I've had them "flipped", I have had them balanced again as a routine part of re-mounting. The tire guys can balance them in about a minute or two ... so why wouldn't you do it?
A buddy once experienced the front tires rotating on the rims. It was thought that this was occurring bit by bit under hard braking and was perhaps due to too much lubricant used when mounting the tires. Not a good thing because of course it alters the balance. I suppose if it happened to you all the time you might forego balancing but that seems like an exception.
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