@Holley3
Like Helen & Rachel I'm an individual Host who Reviews virtually all Guests.
However, I do quite a lot of research of neighbouring Hosts and others in London, all individual Hosts with more or less constant traffic of bookings. Among these I note quite a few hardly Review any Guests even though Guests leave them good reviews. More specifically, where they used to Review most Guests in previous years, the number has drastically diminished over the years.
I am left with the impression that they are Review weary, and are only interested in the bookings.
-- These type of Hosts have also never participated in Host Forums of any kind. Indeed, it's only a fraction of Hosts world-wide who contribute to the Community Centre, so it's difficult to draw many conclusions.