The first which can hurt tracks and promoters is not accepting that fans in the stands and pits are your customers and not those who race at your track.
The second is understanding and accepting those in the pits who pay for the cost of race cars and have their butts in the seat are not customers.
The third is to understand to support your car owners and drivers, you must never make a rule you cannot enforce.
The fourth thing is to realize not being fans or customers car owners and drivers, who invest in your track the same as investors anywhere, must not be charged high fees with no return on investment.
As investors do anywhere in anything, after seeing excessive loss they will either quit investing or move on to other investments. When you loose your back gate investors, you loose both fans in the stands and fans in the pits supporting their favorite car or driver..