No....it's the current cost of a Platinum Pass minus what you actually paid for the pass you have. It also can ONLY be done at the park where you purchased the pass, nowhere else. Or so it has been to date.
Two years ago I purchased a gold pass online from KI and then upgraded to platinum at CP. I'm glad it worked out that way, but it was an anxious wait for the office to open up in time so I could make it to ERT though.
edit: Some of my personal favorites:
Maverick - Front row, this is a must.
MF - Last row
Magnum - 2nd row first car, I believe people on here call it the "ejector seat".
Raptor - 1st row unless its night time lol
Cedar Fair Downs - The horse with orange on it.
Blue Streak - 2nd to Last Row
Gemini - Last Row
Mean Streak - Don't ride it lol
Also make sure you try out these flats: Skyhawk, Power Tower side that launches, Max Air.
In Soak City the Plunge slide is the bomb!
magnum's ejector seat is first car, third row. very painful it is. And I agree with you, 1-2 is a very good seat. Nice air and no pain.