Its a hobby for them I guess. Some people are into these hobbies as they feel the urge of doing something that isn't common for others, as doing the extremes. Its about the rage of their excitement and the intense feeling they feel when they do such things. They are usually called as "daredevils". If I were to do extreme games, I'll choose rallying, I dreamed of doing that or be in a drag race when I was a kid, but unfortunately, I didn't even learned how to drive....lolz!
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And some people like to be famous by doing dangerous jobs.
I do agree with you in the point that they wanna be different even in their hobbies; even these dangerous hobbies may lead them.to death.
About your hobby"rally driving", you seem very courageous person to have this hobby .Anyway, I hope you can acheive your dream.
^_^