The idea of a Burning Man with vendors turns my stomach.
First of all, one simple point, having vendors would not do away with the need for tickets, infrastructure, legal and land fees, etc...
More importantly, the idea of Burning Man is to foster REAL interaction among people and to bring about creative release through art. When money is introduced into the picture, it merely becomes an exchange of goods. Once the transaction has taken place between two parties, there is no more reason for the parties to interact. This I will argue is NOT real, significant, and meaningful social interaction.
Burning Man is not about the exchange of goods. It is about discovering what it means to be a human being and all the creative ways people are able to express themselves. It is about play on a primal and almost childlike level. It is a fantasy world of exploration. It can be deeply philosophical, yet is also very real and exciting. It inspires the soul.
Another thing is that preparation is a fundamental part of the overall experience. Without that preparation the experience would basically lose almost all of it's depth. Having to bring items of survival like food and water and shelter help bring about a sense of self-reliance and the need for community. We are so used to buying everything and doing nothing. Actually what most of us "do" is slave away most of the week in a job we hate and we wish we were off in some exciting place other than sitting behind a desk. We are slaves to money. Burning Man helps show that there are more creative ways of doing things.
The structure of Burning Man will help you discover things in yourself that may come in no other way.
I can only say that if you don't understand the "no commerce" aspect of the event then you will only begin to understand when and if you attend. There is sure to be something or someone there to help you understand. If you still don't understand after that then I'd put forth the idea that Burning Man is not really for you.
