The main exceptions to this are the sales of ice and coffee, which upsets some people. This essay by Larry Harvey (founder of Burning Man) gives an interesting perspective on coffee sales:
Some critics of the Burning Man Project insist that by allowing coffee sales in our city’s Center Camp Cafe we violate a tenet of our non-commercial ideology... My reply is that we’ve never espoused a non-commercial ideology. To be against commerce is to oppose the very existence of civilized life. Even hunter-gatherers engage in trade in order to survive.I'll be back in a week, but the blog -- like any good zombie -- will keep posting
When most people say that any thing or act is too commercial or has been commercialized, very few of them mean to say that the practice of commerce is necessarily bad. Instead, they are expressing the feeling that something essential -- something that should never be bought and sold -- has been commodified. This is why we have always been careful to use the words commodify and decommodify.
Our annual event in the desert is meant to provide an example what can happen in a community when social interactions cease to be mediated by a marketplace. Until quite recently, all societies have provided many different kinds of rites and rituals – set apart from daily life – that rehearse and reaffirm certain core spiritual experiences that are held to possess an unconditional value.