That and the fact you can almost buy two Super hornets for the cost of one F-35C.
Not sure that's correct, now that the multi-year buys for the Super Hornet have ended. The latest request for the additional platforms gives them a unit cost of close to $100 million, which is in the same ballpark as the F-35 currently is.
The F-35 cost will come down significantly once multi-year buys for that platform begin.