Agreed - however they are apparently needed for this install and BC does provide heat shields, clamps etc. which are also "extras". Apparently in BC's experience the gaskets remain intact and can be re-used without problems. In this case the dealer implies the gaskets are serviceable but cometically unacceptable.
I wonder if the tech doing the work was not aware that care was required to retain the gaskets, and there was an "O#$%" moment and frantic digging in the trash heap when he/she realized they were needed?!