You don't have to be wealthy. I wouldn't call my son in law a libertarian; but he is quite poor, but he manages just fine as he buys, fixes and sells cars for a living. He's never paid any income tax as he is off the grid. He owns some 8-10 cars at a time but they are open titles and so he pays no sales tax or registration fees. He'll buy a junker for a few hundred bucks, fix it, sell it, and clear a thousand or so.
He and my daughter are quite happy, so I'm happy for them. He's a poor "John Galt".
If everyone were forced to live under all of the current set of laws, taxes, and regulations then there would be a greater groundswell for less government.
However, so many people are able to sneak around in the gray market that the current system persists.
Where I live it used to be that everyone with a commercial van would plaster it with ads and phone numbers in order to solicit business as they drove around town. Now most of the vans are plain white with no markings. And I'm sure those that drive them will only take cash when they fix someone's plumbing or electricity.