What area ?Tried some indoor racing, although it was on Coke syrup over concrete not dirt. The track was a smaller than a hockey rink, so it very tight and passing was tough - lots of beating and banging and torn up equipment. Needed a much different setup and tires and even chassis than what we used on our outdoor dirt tracks - was a good exercise to have to work that out, but what we learned didn't really apply much to our normal racing program.
We quit indoor racing after tearing up too much stuff in only a few races. Indoor racing died out around here not long after, possibly because too many other teams were also tearing up too much stuff. Other reasons our indoor racing died included: the venues were expensive to rent, their owners did not like the mess the syrup made, and there weren't many spectators (so not enough tickets and concessions sold).
We would consider doing it again if the track had racing room, and if it had a true dirt surface that could hold up all night. Particularly in February and March, when we're itching to get back to racing but the weather won't let us.