Are Valet Parking Rates Negotiable?

If you park your car right in the way and just sit there long enough, will the valet service agree to park your car for a discounted rate, just so you will allow them to move your car out of the way? I’ve never actually experienced valet parking, so I’m really not sure how that works, but it seems like if you just show up an hour early and sit there in the way, you could get a sweet rate on the valet parking.