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NASCAR fans are not very happy with "fuel mileage" races, and I would imagine what you describe would be far worse.

// also not very fond of people who say we watch for the wrecks

But wouldn't it catch on if they actually thought they could help their favorite driver win? Seems like an idea like that could be revolutionary.

As organic_code pointed out, blinding the drivers is a real possibility. Also, races are fairly long and holding a mirror up for two or three hours doesn't sound like a lot of fun. New drivers in the sport have no chance of winning (see last years Daytona 500). Never mind the problem track owners will have selling concessions to a group of people who cannot eat / drink for most of the race.

I want to watch a driver's skill, not the energy output of his / her fans.

I saw sunburned people blinding drivers and causing crashes.

Why recharge when you can just replace the batteries in such a situation? It would make for a better show, anyways.