1) cost a whole lot of money upfront (with a promise of saving money in the long run), making them impractical for most people - things like "buy a hybrid" or "replace older appliances with Energy Star models; or 2) are tiny steps which will save an insignificant amount of energy. ...
Considering that we've lived here for 29 years, I guess it shouldn't be a surprise that there are a lot of things that need to be repaired. Heck, we also have caution tape on one of the two sink faucets in the main bathroom because it broke and I'll obviously want to replace both...