Stormin I'm going to disagree with you on that. If you employ the right people, train them the right way, provide them with the right product and get the right corporate culture there's no reason for a deterioration in service.
Turnover can be a good thing. It keeps labour costs low, keeps fresh blood coming in who are usually more enthusiatic and want to do the job because they want to do it and not because they make too much £ to even think about leaving when they're past their "best before" date.