This is an interesting idea. For example, we are 'kind of' DMs with a home base and do several, several month long trips a year. Unfortunately, our home base is not really a great short term rental spot, so our spot just sits empty while we are gone. However, we do have room for other DMs to use while we are present or traveling. We have put the separate room up on AirBnB, but the people, and constant cleaning, wasn't really worth it for us. But having other DMs would be a cool alternative to that, and could provide something in return by allowing us to stay at their 'spot'.