nostr:npub1fzl62au2n3z78famxg433zkxkms9ald5qew9fzvsk5gcfzus5vzqgeu422 
Reliability as a primary goal is not focused on cost effectiveness. Cost effectiveness often happens when you get it right, but the measurement of it is difficult. If you have no unplanned outages, how do you prove cost-benifit on your maintenance cost? All of your cost of unplanned outages is theoretical- so the engineers don't apply much weight. So, maintenance budgets are cut, and profits go up..... for a while. Then things start to break.