I will probably regret writing this, but...........I have just gotten back in to racing and have enough brushes/springs/etc to last for years and will continue to run brushed until I no longer can keep up. Yep, I'm a tight ass and don't feel like spending $250 just to make racing easier. One side of me says that if you want to run a brushed motor at the Nat's, why not? The other side says that in a big event like a Regional or National, everyone should be running the same thing. If you allow both, you give an even bigger advantage to the well connected "fast guys" as they will have whichever is the best choice for the class at their disposal from their sponsor companies.
And ironically, no matter which way it goes, the same guys will be in the top 10 anyway because they've worked their butts off to be one of the "fast guys".