I think it's a money thing. Dollar for dollar a driver gets more passes on TnT than race days for a lot less entry fee. Track owners often have less employees and use less track prep as well as reduced operating hours. This translates into more money in the tracks pocket. Don't get me wrong I love racing and I feel that at TnT you you are limited as to the info you can learn.
We can only support those operators that let us play in their playground.