This has come up a few times believe it or not and although I accept the comparison could be there, I never really think its valid. What we're really talking about is how detrimental the VIP service is to the normal service. If you take a first class seat on a train or a plane, you don't get to your destination faster, the first class part of a train doesn't arrive in Manchester 45 minutes before the rest of the train does. At the cinema, paying for a deluxe seat gets you a larger seat and legroom, but it doesn't stop the normal seats from watching the same film at the same time. Taking a cab or limo, you pay a lot for the service but you're still going to get stuck in the same traffic that a bus or a car will.
As you rightfully point out, the odds of getting screwed over by a VIP pass holder are low so I have no complaint with them. It's when merlin decide they can sell 2000 VIP passes a year, or 5000 that the whole thing will get out of hand.