It comes down to a matter of degree. How much is it out of balance? If it moves a bit or even moves all the way down (the heavy end), how fast does it move? If you put it on and it clunks to the bottom and smacks the table, then it's seriously out of balance. If it moves very slowly, then it may be air currents moving it (after all, it is an airfoil surface) and may not be balance.

Hey, it's up to the individual. If you feel it's alright, and does not vibrate anything, well, it's probably fine. But, if you feel you have to balance it, hey, knock yourself out! Go for it and balance it. You won't hurt anything.

CGr.