Hope it works for you then. I guess when you say you love the motorsport thing so much and cars etc, makes me wonder why you now want to charge for pics of the guys actually out there. Could be your way of giving to the sport if you cant get out there? If you feel your time and skill is worth something become a pro and get paid like all the pro's do.

BTW how much do you charge if say someone wanted to get you to come and do some photog?