Uh, there are about a million considerations for whether to pursue it as a career or just a hobby:
1. Are you any good at it?
2. What kind of racing is it?
3. What is your end goal? MotoGP, NASCAR, F-1, etc?
4. How expensive is it to move up classes and buy/maintain equipment?
5. Does your machinery enable you to advance and actually make a living? There's a big difference whether you're SX, carting, or some obscure form of racing (say ice racing) that doesn't have a significant market.

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