Absolutely, but unfortunately, it takes most people awhile to figure that out. in the meantime, people coming to a place supposedly full of experts in a certain area will tend to believe what they hear/read there because they don't have the knowledge they need to discern who knows what they're talking about and who is just talking off the cuff. Or to know where to go to find the reliable source that everyone seems to be alluding to but never actually quoting or citing the reference to.
People also tend to believe and remember what they heard first, thus becoming skeptical about whatever they hear on the subject later -- even if the first thing is incorrect and the later thing is not.
I'm a big believer in snopes and other sites that debunk rumors. That, and going to the source when someone makes statements of fact without citing references other than "this is what I have been told/always done/heard at a seminar."
Anyone who has ever played "operator operator" as a child should understand how things change in the retelling. Going to the source, rather than listening to the "I heard this" version, is always the best way to get information. So citing the source of information when giving advice is always helpful.
Isn't that why there is video shopping? So the client can see what actually happened instead of being told about it by someone whose memory may not be perfect or may be influenced by biases or who might have missed a few critical words that completely change the meaning of what they think they were quoting verbatim? "In most cases" does not mean "always." "One option is..." does not mean "this is the way to do this." "What I was told is..." does not mean "This is the truth." Leaving off those qualifiers in the retelling, or any other part of a sentence, can completely change the meaning.
Time to build a bigger bridge.