As Margaret pointed out there are other threads on this topic. We run many A/B tests and for many reasons and we do not publicly discuss the why's, how's etc.
For more information:
Here is our response on the other threads:
Thank you so much for your feedback on the A/B test, it has been shared with the teams performing the test.
We are always testing and learning around new features on the website with the goal of delivering bookings and value to owners and property managers. Anytime a new thing is introduced, it is heavily tested to make sure we’re learning, optimizing and improving.
HomeAway Community Manager