Safety does not have an infinite budget, hence we really have to call it 'affordable safety'. There comes a time when whatever we are spending our $$ on hits a limit. That's why some of us that can afford a classy car buy one, or perhaps that is our ego?
In relation to aviation safety, yes it does come at a cost, but there needs to be limit as spending big does not ensure 100% safety which is not achievable. (unless you stay in bed all day!)