Guests Filtering on villas listing page

I have noticed that big players (like luxuryretreats, airbnb..) of the global market follow a specific process when a user choose guests on the filter tab.

Specifically, if the user chooses 5 guests, the results that he/she will see are 5+ and sorted from min-max. So he/she will see first all the villas with 5 guests and the 6,7,8 up to the maximum number of guests rather than just results that match the criteria provided by the user.

Is there a rationale for this that relates to improving the user experience, as the user has chosen that he would like to see villas with 5 guests and not 5 an more?

Thank you for your time in advance.