In most professional fields where there are measurable and specific standards, the top 1% of performers are considered experts. These experts are highly skilled in integrating various information and knowledge that relate to their profession which give them an unusual depth and provide uncanny insights in their field of expertise.
In PUA, where almost everything is just based on someone's say so, where infield videos can be staged, where female models can be hired, where product reviews can be bandwagon-ed by sock puppets and offshore outsourcers, and so on and so forth, an expert is someone who gives field tested advice that works at least 80% of the time or provides insights on things that you can observe infield which no one else has realized or offered.
That field tested advice has to be crystal clear and not vague which leaves no room for misinterpretation when you field test it, or when you see it unfolding right before your eyes, or when you remember it happening to you a long time ago.
