Meet and greet is a great service that we would probably never self park again!
The car parking people meet you at the airport and they take your car, then on arrival back at the airport they meet you with you car, nothing worst than getting on that bus back to the car park!
The price on holiday extras is for 15 nights, I can't entirely remember the price of extra nights but it may be around 5, but you'd have to check that. Last year it worked out cheaper to book the meet and greet parking and hotel separate as we were away for 22 nights.