If you're in town, you probably can't get away with running it like a business. Zoning and all that... If you were out of town a bit, I'd suggest a few picnic tables and rent the track out for birthday parties or something. Otherwise, it'd be just cool to have for yourself. I'm sure the insurance will be higher if you use it to make money. Keeping it private will save some cost on that front. Also, it might be like a swimming pool... your insurance company may save you some money if you put up a fence to keep tresspassing kids out.