A research team at MIT in the USA has recently confirmed what common-sense always told us:
That if your reviews are already great it will influence subsequent reviewers to write better reviews.
Read this article in today's Mail online.
For our clients:
Dialogue, by (a) minimising negative posts to TripAdvisor and (b) getting more of your guests to post 4 and 5 star reviews, makes this aspect of human nature work in your favour. If you look at your TripAdvisor reviews (and Booking.com and the other OTAs), both pre- and post-implementation of Dialogue, you will see this syndrome working for you.
If you would like to see what other hoteliers are saying about this issue read the Linkedin group discussion here.