How far of a drive is it from Philly to Seattle? You'll regret not trying to get in. $300 is what, 3 tanks of gas in your vehicle?
When the Flyers had it at the Phillies stadium years ago I went and did public skating on the rink. The ice was as bad as the parking lots. I learned that they actually spent a week building up the ice leading to the Winter Classic game, then just dry cut it the week after for all the other events on the ice. By the time I got on the ice, there wasn't much left. Also explained why there was a HUGE pile of snow from the Zamboni on the side of the field.