When I was a kid growing up I could only get a game every once in a while and because of this would play the same games over and over again. Fun unlockables would make these replays more enjoyable because the game would reward you for accomplishing a set challenge. The best example I can think of this is the Timesplitters series where almost everything has to be unlocked and there are so many cool characters to win over the course of its many challenges. Unfortunately I have noticed a great decline in the amount of games that can really say they have a lot of unlockable cool content. I suspect this is do in part to the Achievments which are rewarded for performing the same actions that used to win us unlockables. So are developers being lazy these days or do you believe there is another reason?