JD_Toims - 7:39 pm on Sep 2, 2013 (gmt 0)
My personal "best guess" is if structured data is involved in the fluctuations it's not the ratings themselves changing that is having the influence, but it's more likely to be Google comparing user behavior differences in the results between "reviews / ratings" type pages and "less interactive" [or what are perceived algorithmically as less interactive] type pages.
I guess another version or what I'm trying to say is:
I would say it's more comparative analysis between two different types of results rather than a "direct influence" from the structured data on any give page. [Hopefully I'm saying what I'm thinking so it makes sense to someone besides me lol]