I have one of those Diamond Parking Passes that AAA gave me at the time I purchased Disney tickets through them. As others have stated, you still have to pay for parking, this just enables you to park closer in proximity to the parks. We only used it once at Hollywood Studios. We got there early in the morning so there were spots available, and it was so close to the park- very convenient. I too saw them being sold on Ebay, and I wouldn't pay more than $1 or $2 for it. When we parked, we just showed the parking attendant who was directing the vehicles where to go, and he then pointed us to that preferred parking area. He didn't ask anything of us- DH was driving and just kind of flashed our parking pass at him and that was that.