I don't expect that there's a one-size-fits-all answer. I hope this isn't too subjective.
I'll use this StackExchange page as an example. There are links for Tags, Users, Badges, and Unanswered. At the bottom there are links for a tour and chat. Assume that there's some expense involved with maintaining each, and you can't add unlimited features to the site.
What sort of thresholds are set to determine whether a feature is used and accepted? For example, if 0.5% of users ever try the "tour" feature, do you keep it or remove it? What if it's 1% or 3%?
Do you even set a threshold indicating what use you expect to see for a feature? At what point do you drop it even if it has some users?