Linn Sondek question

What is it about a Linn Sondek LP12 that requires it to be tuned up?  I was at a Linn specialist recently and was amazed at the amount of Linn Sondeks he had just in waiting for "tune ups" or whatever they needed.  There must have been at least twenty.  So, how often does this have to be done?  Is it the springs, weather conditions etc.  I never see other tables requiring this kind of attention for what seems to be required on a regular basis.  Can it be done by the owner?  Seems like a lot of fiddling.  The setup that was there sounded great.  There is a specialist on youtube that posts many Linns and the sound quality is fantastic, but at what cost?  Like I said, I have never seen that many tables requiring attention in my life.  So what his the thing with these tables?