WTF???
The percentage differential here is due to cost of services & the fact that many of the clients are married.
A BJ is viewed by many as acceptable & less guilt associated with it.
You have to take it for what it is.
If the review is for full service then you compare it to other full service reviews.
I would agree that most of those out there who are engaging in this activity are not putting up reviews because most are not active or even aware of these boards.
Also a review of a BJ is rather bland compared to a FS one so I would assume most do not bother.