Keith J, Ktm 50s and cobra 50s are not cvts. They are single speeds. The single speeds work well on the little bikes. The same setup on a heavy mini quad requires more maintenance than on a bike that weighs less than half as much. There are less variables to tune than a cvt. But, quite limited by the single speed transmission vs Continuously Variable Transmision.

All forms of racing are expensive. The cost of the racing is only determined by the size of your bank account and level of addiction. Quad racing will always cost alot more than dirt bikes as long as there are no race ready production quads.

Money can't buy championships. But, there is a strong correlation in the mini quad world.