Front Suspension problems of the 2002 Lexus IS300

The front tires after 19. 500 miles inside edge of tire down to steel belt. Outside edge of tire looked brand new. Contacted dealer and the the dealer inspected the car. They recommended replacing the tires and aligning the front end at a whopping fee of $732. 00 and told me that this was normal tire wear for 19k miles. I took the car to two different tire shops and was assured that this is not normal and that a negative camber of the allignment would cause this type of wear pattern. I do not dispute a tire of this caliber will wear quickly. The wear pattern is what I dispute. This car has an allignment problem!! I purchased two new yokohama tires with the same specks as the original bridgestone tires and had the front end alligned and will monitor the wear very closely and report back my findings.