The teams pay me, simples. I then put together media and PR packages, disseminate news and images through my network of local and national press, international press, specialist press and websites, most of whom publish (they get the releases and photos if they've asked or published stuff in the past) and none of whom pay for it - that's why the team pay, so the publication can get it for free and are more likely to print it (regardless of whether it's a newsworthy story, unless it's an exclusive nipple slip of some trashy teen z-list celeb they aren't going to pay).
The only Motorsport related photo I have ever been paid for was an exclusive of Liz Hurley and Shane Warne (neither of which are related to Motorsport) at Goodwood Festival of Speed (there we go, the tenuous Motorsport connection) which most daily's picked up and paid handsomely for.