The growth of NASCAR over the past decade has been one of the stories of American sports – and not only was the series getting huge viewership, it was attracting stars from other series and its drivers were breaking left-turn-only taboos at Le Mans and the Race of Champions. Still, the dream couldn't continue unabated, and lately NASCAR has been battling dwindling audiences at some of its big races and disappearing big-money sponsorships. To get around it, teams are doing three things: getting more sponsors, finding those sponsors further away from the traditional corporate playground, and engaging in "non-traditional sponsorships.".
Autoblog, How NASCAR is coping with its slipping audience