Because they try to steal as much as possible before they are arrested. What surprises you?
Well, if you are really a smart. I think stealing of few is better than stealing a lot. It might become your endpoint once the authorities will look at you. Stealing few money is not much interested to the public. But if it arise from hundred million dollars, assume that you have only a month before you will be tracked. Unless, you have no evidences left to the scene. Now, this is the reason why OP surprised. Because you can made some money by hacking without being arrested. You just stole few. Well, either it is few or lot. It is bad to do things like this. Hell is waiting for hackers.