I’ve not been to burning man but I have been out on the playa during a squall. They are stuck there for the duration as you cannot drive when it’s muddy - you will get stuck down to the axles. 73,000, stuck in the mud.
I’m not an expert in that type of environment, but I would suspect that the more vehicles that have to get out, the dryer the roads have to be. I’ve had my own experiences in mud, and while the first vehicle made it through just fine, the second one definitely struggled and did more damage. Luckily, it was just a muddy spot in a construction area where if something got stuck We had other machines in nearby dry ground to pull the stock one out.