dont know about the cost of one but i do know the guy who ran the one in mass told my husb when we went there a few yrs ago that it cost him about $5000 /month for the heating bill. i believe it only ran races sat/sun.
i will ask about it on the nebmx news site there are plenty of people who were involved with that track there.
i love the indoor idea as long as you dont put it in
SOUTH JERSEY
🙄