Your right its not rocket scienc, but if my pickup as issues.. why spend all the time going to walmart buying the stuff and takeing all that time to do it when they will come next door get my pickup, fix it and have back in our lot in 30 minutes at no cost to me and they will do that as long as I own the truck?
But I understand your reasoning.. Do it yourself and you have another excuse to get out of the house. "no hunny I can't wash the dishes, I have to fix my van!" Did I mention I like your thinking!