I've never been to dirt burners but from what I've heard it's only like that during the Kyosho race. I think one problem at bigger events is that they adhere to the rules and preform no maintainence on the track during the event. I guess that is to try to provide consistency but the way I see it, drivers wind up driving 3 rounds of qualifying on 3 different tracks and if you don't get a good time in the first round it's not likely that you will have a chance to improve in the later rounds. I have been running on some more loamy tracks lately and while they break up a little faster, repairs can be performed very quickly.
We still had to water to keep the dust down though.