Collecting video games is a much more expensive hobby than it used to be; With more enthusiasts participating every day, the value of some of the most memorable games of the past has skyrocketed. Many titles for PlayStation 3 which were once fairly common finds, are now seeing prices rise as they become rarer and harder to find. This is particularly true for any collector’s editions or rhythm games with instruments like rock band. While most collectors’ current fixation seems to be on the sixth generation of games, some excellent seventh generation games have seen huge price increases in recent…