So they ask me if I wanted the gig this year. Paid? For riding my bike?

I am now the official motorcycle driver for the official photographer of the http://napavalleymarathon.org/ on Sunday.
We'll see how this works out. Sounds like fun, but the other two told me at coffee this morning "Sure, you'll have fun. Yeah, you'll like it."
Supposed to be $100 plus .53 cents a mile.
why not?