as many, 1/ dont know what they doing 2/ hope for easy fix and money 3/ just change this or that and hope and in the end you pay for all unessesary parts anyways, easy, hell, even main brand auto do it, in fact T and S and B are all proven to do this, seems the go getter small guy shops know better than the big authorised dealers... same goes for bikes... its oppisote to western countries...