Use a tool for what it's intended. I think most tool abuse comes from improper use, ie... prying with, or hammering a screwdriver, cheater bars, stomping on a wrench end or hitting it with a hammer, etc. As to rust, just keep 'em dry or wipe 'em off if they get wet. Store them in a good place and keep things organized. It's that simple... I will admit, I do use a cheater bar from time to time, but I don't blame the tool if it fails.