Don't invest money you need in a racetrack
They say that experience is the best teacher, so I will offer the perspective of someone who (1) has had several hundred thousand dollars of his retirement funds "invested" in joining with other hopeful race-lovers in building and operating a race facility for 14 years, (2) has been involved at various times as a board member, president, manager, etc., of it at various times, (3) has studied race track economics operation at facilities all over the country, and (4) has seen so many smart and hardworking people try to deal with the economic realities of the business in so many other facilities around the country: DON'T do it unless (1) you have a big pile of money you do not need or you can tap the resources of rich people or entities (corporations, government) who will provide the funding, and (2) you love racing so much that you are willing to donate the big pile to subsidizing a race facility that will not provide a return on the investment.
You've heard the old saying that the way to make a small fortune in racing is to start with a big fortune? You haven't seen anything until you apply that theory to building a racetrack.
I love racing, but I have decided that from now on I will be content to blowtorch my remaining money on the smaller scale that we race car owners and drivers do. See you at the track. Hopefully somebody else's track.