I'm an owner and to be honest money, while extremely important, is usually way down on the list of things that the crew is unhappy with.
They can still come to you with any other issues and if they come to you about wages then redirect them to the owner. Realistically speaking $.50 or a buck an hour isn't going to make anyone more satisfied in their job, especially if they have to ask for it.
Also, Chefross has a very good point. That much turnover is a massive red flag.