Am beginning to see more ads with SPs providing their Myers-Briggs personality type.   Isn't the whole experience (well, at least at a certain price point) about fantasy: curated experiences and whatnot.  Why reveal this sort of personal info; especially before someone actually becomes a client?

Or worse than just pseudoscience. It's a SCAM used by human resource morons to justify decisions.  
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http://en.wikipedia.org/wiki/Myers%E2%80%93Briggs_Type_Indicator
... The Myers–Briggs Type Indicator (MBTI) is a self-report questionnaire that makes pseudoscientific claims[6] to categorize individuals into 16 distinct "psychological types" or "personality types".  
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... The perceived accuracy of test results relies on the Barnum effect, flattery, and confirmation bias, leading participants to personally identify with descriptions that are somewhat desirable, vague, and widely applicable. As a psychometric indicator, the test exhibits significant deficiencies, including poor validity, poor reliability, measuring supposedly dichotomous categories that are not independent, and not being comprehensive. ****Most of the research supporting the MBTI's validity has been produced by the Center for Applications of Psychological Type, an organization run by the Myers–Briggs Foundation, and published in the center's own journal, the Journal of Psychological Type (JPT), raising questions of independence, bias and conflict of interest.****
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... Media reports have called the test "pretty much meaningless", and "one of the worst personality tests in existence".

Corporate BS sold to them by consultants

ISTP’s give the best head.

That might be useful to know, if it was true.  
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I wonder if the MBTI company would be willing to fund some research?

I think that the fact that someone posts their M-B Type is MORE informative than the meaningless "WXYZ" type itself.  
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I agree that everyone can draw their own conclusions and make their decisions accordingly.