I found the following quote directly from Inspirato's website, which should help clear up that they are not a brokerage.

"Our $700+ million portfolio of more than 235 Signature Residences offers a level of consistent excellence often unavailable through online villa rental providers. Before designating a home as a Signature Residence, we typically invest an average of $50,000 in upgrades to ensure that the furnishings, bedding and linens, and other features are consistent with our exacting expectations. We fully manage and control each Signature Residence 365 days a year, and they are available only to our members and guests. We never place these homes into a "rental pool" for public use. And each Signature Residence vacation comes with dedicated Destination Concierge service to ensure your trip is the best it can be."

https://www.inspirato.com/membership/membership-faq

Here are a couple of additional links:
https://www.youtube.com/watch?v=dDj8O5qbpho
https://vimeo.com/121679230