What does it cost?

Hobbies cost but i think the problem is us. I have seen some take an already very nice car and spend a fortune to completely re do it? A lot of money can be spent on aftermarket pieces that don't provide much improvement...and are often a step backwards for a street driven car.
Stock parts often perform better, but that's no fun.
I don't think the hobby has to be expensive.

I agree. If you can stay away from the perfectionism, it gets a lot cheaper. My goal has been a nice 10-20 footer driver. I have resisted replacing chrome parts & stuff just because they have some surface blemishes. It all depends on what you want & what your goals are. Everyone is different.

I have decided I want more driver quality cars than one really nice one, but that is just me.