And I'm not an exception either: https://en.wikipedia.org/wiki/Typing#Hybrid
"The number of fingers does not determine typing speed... People using self-taught typing strategies were found to be as fast as trained typists... instead of the number of fingers, there are other factors that predict typing speed... fast typists... keep their hands fixed on one position, instead of moving them over the keyboard, and more consistently use the same finger to type a certain letter."
Would it be great to be able to type 100+ wpm? Sure. But if I have to dedicate all that time and effort, I'd much rather spend it on something else. Like learning a new technology or taking time off to pursue other interests. Besides, the amount of time I spend typing is a fraction of the amount of time I spend thinking. I honestly doubt that my 60+ wpm has held me back in any significant way.