My DJ Hero

So I do not understand this. My husband has these wonderful turntables and a special table that we bought for them and a mixer and speakers. The whole nine yards not to mention a pretty decent vinyl collection for a beginner. He then tells me that he is going to go and buy DJ Hero. Now I know one is the real thing and one is a game. Wouldn't the time playing the game be better spent doing the real thing so that you can be a real DJ hero? I might be missing something but oh well sometimes I think that there are just certain things that I will never understand.