1 most countries host marathons, not just the richest.

2 Just pointing out there is probably a reason the majority of marathons are I'm City centers or are small.

3 Burning man is 9 days long, and incredibly expensive to attend since you have to mostly self cater. There are marathons like this (remote and self reliant) but can only host so many runners.

4 it doesn't shut down the city for the day, most have cut offs for runners by early afternoon and a lot of the course opens up after the runners go by.