Does anyone still have a vacation buy back? I know there used to be lots of companies that would buy back up to 40 hours once every 6 months. Worked great, you could sell back a weeks worth at Christmas time and summer time, so you had some cash to actually enjoy any time you actually had left. I know I generally don't have the spare money do do much when ever I actually have time off; and on the Rare time I have spare cash (is there really such thing) I'm working 60+ hrs a week for months on end.
As a variation; a lot of paving companies will shut down 1 week at 4th of July and a week between Christmas and new years. It helps eliminate all the scheduling problems, and superintendents and higher would get a third week worth to use the rest of the year (but probably better not try to use it all at once)
My previous employer would allow you to sell vacation time in one week increments any time you wanted to with management approval.
My current company used to let you sell vacation years ago, but they've done away with that and moved to the system of limiting how much you can roll over and paying out any excess at 50% of your pay. The idea is to encourage you to use vacation the way it was intended. To get you away from work and relaxing.
Vacation isn't supposed to be some kind of cash bonus. Cash bonuses are for that...