Natural(?) progression in my case
You start with taking your road car on the track and enjoy it
then you take some coaching lessons to get better
then someone convinces you that you should try a race car instead of brakes, as the car is lighter, better brakes yada yada
then someone convinces you to try the difference with slicks,
after some serious sticker shocks you enjoy it,
you start using telemetry to compare yourself against a coach and against yourself
and then somewhere along the road go, hmm, wonder how it would be to race against other human beings instead of just against the clock and telemetry
next thing you know you are on your first formation lap for your first race, seriously questioning your life choices and how you ended up surrounded by 20 other idiots in cars costing several hundred thousands.
and from there, there is no turning back, assuming you have a PhD in man Math and somehow can afford it...