Look every form of motorsports starts cheap. But there is always someone who is willing to spend whatever it takes to hold an advantage to win. This drives up cost at all levels.
Used to be all racing was inexpensive but then the cost go up as people pay for more tech or advantages.
I though the Soap Box Derby was cheap. How expensive can it be to just send a kid down hill in a homemade race car.
Then we found you had to several thousands dollars in tools including a set of scales just like you use in ,midget car racing as balance is the key to a good car along with alignment down to the thousandth of an inch. Kids no longer build these cars. Families no longer build these cars. You find there are guys who have been building them for others for a number of years now. Well we build our own did ok.
We used to local stock car race but there again some guys had more in their clutch and rear gear than we had in the car.
We never dominated but we did win at each and that was a major victory on to its own.
The worst enemy of racing is tech and money.
Note I always admired Roger Penske as he had the unfair advantage. But he had the money to pay for it. In the end was it really good for the sport?
On the other hand Smokey Yunick held some unfair advantages. But most times they involved legal at the time or some not so legal modifications that generally were not all that expensive. I admired that even more.
If you want to watch a good realistic $3k budget drag race, watch the original $3K Hooptie Challenge on Motortrend. That was a realistic representation of a real $3K challenge. There were only a few questionable ringers that exceeded the $3K budget, but most of these cars I would no way spend $3K on to buy it from them, except the Caddy powered Gremlin, of course......