In some markets the USVTA Rules are hard to get to fly (read CALIFORNIA) - but out here they started a "Outlaw VTA" class this year which uses any ROAR Legal blinky ESC, any ROAR Legal 21.5 motor, and doesn't require the driver figure...and finally a VTA type class is growing out here.
There is one track that has also started a US VTA ruled class...and now that people are running some type of VTA - they are ALL getting more popular.
I say.... offer BOTH - and let racers decide. (If the numbers are small...run them both together, and score them separately...most scoring programs can combine classes)