"We've got a number of people that have been here 15, 20 years and they have $1 million plus balances"
Sounds good but they are catastrophically undiversified. Nobody should have their entire nest egg in one stock. Yes they are motivated for the company to do well, but so many things play into a stock price that are out of any one person's control.
Just giving them profit sharing that they can invest as they wish would have most of the same motiviations. Anyone making a decent wage and saving in a 401K should be able to save $1 million over the long term. And do it much more safely in a well-diversified portfolio.