Peter Drucker:

“I have been saying for many years that we are using the word ‘guru’ only because ‘charlatan’ is too long to fit into a headline.”

I value doers over gurus. Why pay someone to give you there wisdom when you can learn it yourself?

Big word help: A charlatan (also called swindler or mountebank) is a person practicing quackery or some similar confidence trick in order to obtain money, fame or other advantages via some form of pretence or deception. (Wikipedia.)