Should health insurance and medicare be able to ban someone who was proven to be a bug chaser? It would be a lot less attractive of a community if the main topic of conversation was, "How will I get ahold of the money that I need to stay alive?"
That's harsh, but right now the fact that you don't have to pay any portion of the costs is essentially endorsing it as a lifestyle. You should be able to put people on the list the moment they mention the interest so that they know they're on their own if they go through with it.