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Funniest part of both of these posts is they aren't entirely smart ass answers. Things go well it is a relatively cheap weekend of fun. Things go south not so much.
Figure if you have your license and all the other equipment you would need for a weekend than not too expensive. All of this taking out the added costs of blowing up your bike or crash damage as they increase the costs exponentially.
Entry Fees: Race entries for 3 races as a novice should run you around $200-$210
Lodging: If you enter 3 races camping in the infield is free if you enter less than that then they charge you $25 for the weekend.
Fuel: Depends on what you are riding and what kind of fuel. 10 Gallons of 93 say roughly $35
Food: However much you want to spend on a trip to Shaws, Checkered Flag or the pizza joint down the street
So overall not too much once you have everything.
Just starting off you would need to add in the cost of Penguin School, License Fees, numbers for your bike, transponder bracket, plus renting (or buying) a transponder all of which can drive the price of a single weekend significantly higher.
Come join the insanity! Its a good time.
Joel