To me it is the doing it yourself feeling. Transmission went out in my truck, I bought two books on how to rebuild transmissions. To my surprise it really is not that hard, truck shifts fine to my relief! Anyone that can dig into a motor can do a transmission IMO. But to me it was very satisfying. I also have a short fuse when it comes to bad info or price gouging. If a shop gives me a bad answer when I feel he did not know but just wanted to help so he tried and just pulled something off the top of his head, rubs me wrong real bad. I like people alot more when they say "sorry I do not know" so usually when someone gives me bad info I never go back.