I think that you brough up an interesting point that I've really never considered before... I just had a major service done on my car at an independent shop, rather than at the dealer. I was suprised how much lower the bill was and after inquiring why it was so low the shop informed me that many of the things that dealer replaces at a major service (i.e. cap and rotor...ect) were still in good condition... I guess when you take it to the dealer you're also paying for peace of mind...