Jesus that's expensive.... up here we have Talladega Grand Prix. Think it's in the 1500/day range... pretty sure the Titan Motorsports guys have been up here recently. There are cheap events out there pretty much monthly.
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1995 BMW 540/6 - The Track Rat
2009 Ford Escape - Stock Toy Hauler/DD
2007 Lexus RX350 - Stock Wife Hauler
2009 Kosmic - The Toy - 125cc Vortex Super Rok TAG, (For Sale - $2800)
2007 Intrepid Silverstone - The Faster Toy - CR125 6-Speed