I'm a bit confused. You said you upgraded to Plus, then said it was their highest level, but its not. Premier is. Did you upgrade to Premier finally before they sent gas ?
FWIW, I drive my car to the track / events and wanted to have AAA just in case but was going to only get Plus. They talked me into the Premier for a few bucks more because only Premier will cover motorcycle towing. Having that gives me safety for all my car ( and my family member's cars ) as well as motorcycle, so unless you are by yourself and only commute on two wheels, I would recommend keeping that AAA membership.
FYI, if you talk to the agent and ask for deals / discount, they can usually help out a bit. All in all, I paid $109 for my Premier including the $17 enrollment fee.