How much do top fuel drivers earn a year?

First, you share the winnings with the people who built your car, your crew and anyone else who is part of the team. That part is based on your contract and it's impossible to say how much an individual driver would earn from that.

Second, endorsements are based not just on your ability, but also on your general appeal. If you are the best driver on the circuit, but come across as a pedophile, you're not going to get much in the way of endorsements, so that will cut into your ability to earn.

In short, it's difficult to say what such a driver might earn. In life, you don't earn what you're worth, you earn what you negotiate.