This is genius. Many people feel stuck in jobs they don't like for financial reasons. They're surely not as productive as they could be if they were happier. Providing even a small bit of assistance to help them out the door helps both sides. Employees don't feel trapped and employers don't have to wonder if their employee is just have a rough time or if he/she does not want to be there any longer.

Not to mention, as another commenter pointed out [1], once you decline the money you will look back and remember you made the decision to stay when presented an opportunity to leave.

1. https://news.ycombinator.com/item?id=7572688