Micro's are real big here on the east coast. 50-75 micros at the track isnt uncommon.
Minisprints like mine are almost gone. Used to be a lot of wrecked 1000cc bikes. Way more wrecked 600's now days.
If I wanted to run fairly local I would have zero choice of which open wheel car we would run. It would have to be a micro. I don't agree with the 600 cars not being a good stepping stone for for D-2 midgets or whatever. They will teach you car setup and good racing skills (both more important then money in the long run). They put on great racing on the right track and they can be economical.
I actually think they would be a perfect car to have on the D-2 program. Dad can run a D-2 car and for a few grand more you can have the kids race on the same card. There is also quite a few young female drivers showing there talent in them.