Keeper of Things

How is it that we become the keeper of things? Why is it we are always supposed to know where everything is? I keep telling my family that if they put things back where they got them they would know where they were. Why is this so hard to do? The silverware always goes in the same place, your socks always go in the same drawer, the towels are always on the same shelf. Why is it so hard to put toys back in the same place or put keys in the same place every time? If I kept track of all the time in a day I spent telling or usually showing one of my family members where the lost item is, I would have an extra hour a day! I have started saying "I don't know where it is, why don't you try remembering where you last saw it or look for it." Once they spend time at least looking for it, then I am more willing to help them find it. The one that drives me the most crazy is the "I can't find it." I then reply "Did you look in xyz?" "Yes", they say, so I get up and go look and sure enough it is right there but slightly behind something else. Is there some rule that says you are not allowed to move items to see behind them? I don't know if it is a gift or a curse to remember where everything is all the time. I wonder if I just stop helping them find things if they would eventually start remembering where they put things? Maybe I should start collecting things and then make them pay me to get them back. Could be a lucrative part time job!