I like to skateboard as hobby for fun.
Me too, I like impressing people by performing tricks using a skateboard.
I'm not good at it.  I can't do any tricks like you. Tell me more of what you know.
A 2009 report found that the skateboarding market is worth an estimated $4.8 billion in annual revenue. Thats quite a lot of money when you think about it.
That's a ton of money.  I didn't the skateboard market was that Huge!
Yup and there are 11.08 million active skateboarders in the world. Thats where all the money comes from.
That's a lot of people on little boards with wheels.
Those little wheels have caused damaged curbs, stoneworks, and steps.
Yeah I see people in our downtown area skating all over the historic places.  Sure they are doing some damage. 
No wonder skateboarding has become controversial in downtown areas.