Ultimately, it sounds like they did you a favor but that you need to curb the behavior to prevent unnecessary work and being over charged in the future.We have run into issues like this many times in the past.

My place sleeps a lot, and so, is often rented by large groups of "friends", no one with a majority stake in the collective negative outcomes of their behavior. 

Criticizing others for their failure to do the same provides them self-justification for their confirmation bias.This is a common behavior pattern to justify many debatable decisions people make in life.

S8 is clearly not responsible for the behavior of your tenants. 

What are the best practices for listing a property to virtue signal that there will be a buyers agent commission paid by the seller based on buyer agent behavior such as ensuruing that the offer contains an appraisal gap coverage, waives inspection and other elements that are desirable by sellers?

This type of business behavior is shameful and a disgrace for those who are working hard and really trying to make things happen. 

Buyer agreements were already required by law in 18 states plus DC.Not displaying commissions on the MLS is less transparent, but is no big deal at all.

Some, but not most.I guess you could ask to see the display screen of their CRM and show you their contact count. 

Curious if anyone else received this same email from VRBO today:"Subject: Vrbo property rate discrepancy error – action requiredDear Partner,We're reaching out to let you know that we recently discovered a technical error that may have caused your rates to be displayed incorrectly to travelers who booked your property between July 29 – August 9, 2024.Please review the property rate for the following reservations IDs:XX-XXXXXX, XX-XXXXXX, XX-XXXXXXIf you believe one of these reservations was impacted, we ask that you honor it and contact Vrbo Support within 30 days of receiving this email to file a claim for the potential difference between the booked rate and your actual rate.You can reach Vrbo Support 24/7 at https://help.vrbo.com/?

Perhaps displaying it in a format like a TD Ameritrade or other investing site.