Having little to do with Leap Year Day specifically, but with February in general....
February's shortness poses a real financial hardship to some people in less than ideal financial circumstances. Since it has two fewer days than any other month, it also has two fewer workdays. So, when the rent comes due on March first, there's two fewer days' pay in the cookie jar with which to pay it.
The decision to have February have 28 days predates modern wage-earner society by 2000 years. We need to even the calendar out by taking days from two of the 31-day months and adding them to February.
By the way, did you know that in ancient Roman times, the calendar only had ten months, March through December? Since nothing of any importance happened during the dead of winter, it wasn't even included on the calendar.