You know, it's all about trust. Over the years I have changed dealer/repair shops several times after learning that they "misrepresented" the facts.
I'm sure that most repair shops are honest, BUT?
I can't imagine 4 sets of bearings and races being 'bad' after less than 6000 miles. I would call them out on it....and then I would never darken their doorway again. Just sayin'