Nobody needs airconditioning or a heater if they own a van. I have a sleeping bag that is good down to -10F and of course when you are not asleep you have the option of being in a warm classroom, library, nursing an endless cup of coffee in a cafe, etc.

The only thing that bothers me about the scenario is the careful statement of being "voluntarily" poor.  Heaven forbid you should be identified as just plain poor?

I've actually seen Catholic parishes ban people for being perceived as poor. In one case, a woman who asked for a "prayer blanket" let slip that she was living in the same shelter as the cancer victim for whom the blanket was intended.  She was ostracized after that by the same people who loved her before they found out she was not from the same wealthy district as them. They even appeared to be worrying about not profiling people economically in the discussion that followed that incident.

 In another case a woman sold a car for $300 admitting that she simply couldn't afford to own it and she was subjected to accusations of being "out of grace" by the coven-like group of busy-bodies who actually used rosary sessions to "pray against sinners among us".  The various speculations about why a Catholic might be punished by God with inability to afford a car don't merit expression here. Let's just say they were sordid enough to merit a warning sermon from the pastor when he found out about the witch-hunters in his parish.

No Catholic should have to claim whether poverty is voluntary or not, because it doesn't matter. Material things don't matter to us. We don't follow the Protestant gospel of abundance because we still list "greed" as a sin, regardless of the resources available to the person who might be tempted to greediness.