Sam,
Where do you get the audacity to compare tzaddikim (I assume that’s what you mean by Rebbe’s) to doctors and lawyers (r”l)?
The ideas that you mock are sourced throughout all areas of Torah.
P.S. For a beautiful explanation on the concept of asking tzaddikim for brochos, see the Chasam Sofer (among countless others) שו”ת או”ח סי’ קסו