My 99 forester is wearing out the inside tread on both wheels.I just got back from a repair shop that told me that my steering components look ok (inner/outer tie rods and ball joints)he mentioned that there is not much adjustment for camber problems and said might be time for some new springs and struts.does anyone agree with him or do you think that there might be another issue causing the tire wear

Your title says vibration, but your description says uneven tire wear.  One or the other or both?  Worn tires can definitely cause a side to side wobble in the steering wheel.  Is that what you mean by vibration? How many miles do you have on it?  Unless you off road a lot or have a buttload of miles, your springs should not be shot.  Strut wear doesn't affect the geometry of the suspension (unless they're physically damaged).  The bottom bolt in your strut mount is a camber adjustment bolt.  Get new tires, and have them do an alignment. 

Edited January 3, 201412 yr by Timberwolf530