Hey Dufferin...
I see your points and it also made me think; however, I would still have to agree with Oppal's comments.
He does bring a fine point in the Miko scenario (there's a thread in the Vancouver MP section) where she was so busy she was pretty much booked up until 3AM... every other hour she had a client. The poster said that at that point in the day, she already had 8 clients booked - can you imagine having that many people show up just because you were reviewed on perb?
I would agree with you that YMMV does happen with most experiences - hell, you could have a different experience everytime you see the same SP - it's up to the mood of both parties and and the experiences that the individuals have had during the day up to that point.
I just think that if anyone found the motherload, they would be reluctant to share it with everyone lest they the motherload becomes unaccessable...