Maybe the tire place knocked the weight off on purpose so you would come back (lol).
Anyway, think of it this way. Have you even seen a celing fan wiggle when it is spinning? They get like this when they get dirty or bumped. Imagine what happens to a tire when it is not balanced. It can cause large amounts of vibration.
A sure sign of an unbalanced tire is that the vibration will start at a particluar speed and then go away, unless it is really bad.
If you don't balance the tire, the tread will get cupped and feathered if you drive on it for a while and you will have to replace the tire...and this means usually replacing at least two.
I think it is a good idea to balance tires every other rotation.
As far as the previous owner bumping the rims, they are probably fine. You need to smack a curb hard or hit a pot hole hard to warp a rim...especially with aluminum rims. Aluminum does not bend as much as steel.
For the other guys: Do you have to go to a special tire place to have weights mounted on the inside of the rims?
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