Wow! Just wow! This level of entitlement for something Tesla gives its customers for free is mind boggling. Make no mistake; you did not pay a single dime for the electricity used at Superchargers. It is free. You just paid for the onboard charger, just like customers paid for dual onboard chargers. You are not entitled to any free energy just because you are a Model S or Model X owner. Model 3 owners won't be entitled to it either. People should remember this. Tesla is giving us free electricity as a COURTESY. They can stop giving a specific customer (or everyone) this courtesy power any time they want.
Just to clear up a few misunderstandings.
1. There is NO "supercharger charger" in the car! The chargers is in - surprise! - the supercharger... It is about 12 charger in a supercharger, the same - or about the same - as you have one or two of in your car. So no, you do not pay a penny to have a "supercharger charger" installed in your car. The "supercharger hardware" in the car is a contactor that routes the power direct to the battery without going through the installed charger(s). This hardware is included on all cars produced by Tesla - except perhaps the Roadster. (Is there any DC charging on the Roadster?)
2. The $2000 fee to get supercharging in the 60 (included on all other models) is what you pay for 2a) the build-out and maintenance of the SuperCharger network and 2b) the electricity you may use.
So yes, you have paid for this electricity. Some uses more then they have paid for, some less and some does not use it at all.