It could be because the agencies are asking for them. A lot of businesses are asking for reviews now.

The agency board on one of the other sites is almost solely dedicated to them

I've recently seen two of that agency's gals and posted reviews. I chose them for my "return" to hobbying based on a recommendation.  

I've never been asked to post a review. (They have never contacted me at all after an appointment. Which is one of the things I like about them.)  

The volume could partially be due to the fact that they always have new ladies so it's enticing to keep returning. They also have been, for me anyway, easy to do business with.  

That being said, I've read a couple reviews of the ladies I've seen and did wonder if that person actually saw them because the experience was so different than mine and maybe they were posting just to get temporary VIP Access. I imagine that  happens from time to time, especially with agency gals who rotate in and out of town. But maybe the different experience is just because providers aren't robots and YMMV always applies to sessions, and it's a more satisfying hobby when you learn to just go with the flow.

I've never been asked to do a review by either of the local agencies.

You may be able to answer a question I've always had about K-agencies. Given that the  ladies are always changing and turning over, is the provider you review likely to be the same provider someone else sees?  In other words, if I went to see a lady who you had given a strong review, would I be seeing the same lady a few months later?

I don't have enough experience with them to even speculate on that.

Been a long-time K-gals client but never been asked to leave reviews. On the contrary, it seems they prefer to go under the radar.

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One of the two agencies seem to have disappeared  

Had been out of to town for an extended periods of time. Came back last week and their website is gone

Yea they allude to sum nationwide issue about k agencies on another board

Exactly, which is why they're getting reviews