Webcomic Collectibles?

That print comics is a market ripe with collectors is not news to most people, but apparently webcomics also has its collectors. Recently Penny-Arcade made a limited run of prints featuring their characters Twisp and Catsby. 450 of the 500 prints were sold in less than 12 hours through Thinkgeek, each costing 80 USD. Since then at least two of the prints have appeared on ebay.