If you look closely, not all wheels are made the same. Because they are molded and not machined, some will run more true than others. This will cause a visual wobble that is not actually an imbalance, and cannot be prevented. Typically a few small wrecks will knock even the truest of wheels out of round as well. It's not really something to be worried about.
The warped wheel effect is well detailed in Jilles Groskamp's you-tube video about setting camber.
As for the wheels being out-of-balance, that's the cause of the vibration you can feel when revving the car in your hand. Even if you apply lead tape to make them balanced, a few runs will cause the tire and insert to shift and unbalance the wheel again, and you will be fighting a tough battle. Shimming everything helps reduce the visual wobble, but the actual vibration is just transferred into the suspension...
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