I actually think these MCR songs are pretty fun to play, so I'm glad I went ahead and purchased. Like someone else said, I would have definitely sawpped out Famous Last Words for Mama or Black Parade, but oh well.
I get that some of you think that buying these will only encourage further pricing at this level, but come on, the pricing structure has been in place for multiple packs now, a few purchases or boycotts one way or the other isn't going to make a difference. If, in masse, people didn't want to pay 500 points, they wouldn't have come out with further packs at that level.
For me, I like MCR, I like new master tracks and I like the Circuit City deal that has kept me flush with points for the forseeable future. All that = buy.