If you think $600 is crazy, viper.fox is paying off a set of 3 cards that (together) are way more than ten times more. And I'm paying off a card twice as much. Collecting can be a crazy, crazy game at the highest level. The first time the No. 1 trophy changed hands (dunno if it was the 1998 or 1999), it was for over $20,000.
Ironically, now is a great time to get the rarest cards in the world. Of course, they're still require serious cash, just not at the $20,000 for now. The great thing about the card game is that whilst prices for pretty much everything has gone down, it hasn't collapsed. As the economy recovers and collectors start getting more cash, you can bet those prices are going to start rising...