Front Tires Are Wearing Prematurely

StrokerScamp said

Usually inside tire wear is caused by one of three things....as long as all the parts are good. 1) Not enough toe in. 2) Too much negative camber. 3) Lack of rotation. Nine times out of ten, it's not enough toe. Oh and find another alignment guy. The one you are using is an idiot.

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99% of the time and Idiot. (Keywords)
I do my own right here in the driveway and never have tire wear issues.
Try this sometime.
Set your towin using the insides of the rims and set it so the front is about an 8th closer together than the rear of the rim.
Find a spot where you can get one tire off the pavement onto dirt moving very very slow.
Pay close attention when the tire contacts the dirt and notice if the car jumps sideways just a bit.
Theres the first clue.