What about wear and tear on the track? Carpet -- wear and tear can become expensive and the track must pay for repairs... Dirt -- the track needs watering and maintenance to keep it in good "race" shape and water costs money and the time put in by the track staff costs money too... Electricity -- they will probably use some and the track pays for it... "Sanitation facilities" -- They will use them, and water/sewer charges from the city/count must be paid by the track...
And the "BIGGIE" -- INSURANCE! Current liability laws put ALL responsibility on the owner/operator of the facility... Someone could break in, shoot at you, attempt a robbery, but if they fall down and break a leg, YOU are liable for their injuries... You gotta love LAWYERS, right...?