Resources are only useful if you use them.
With that said, I want to be clear about something here. If you own a hammer, you don't have to use the hammer once a day to justify having it. You may not even need it as much as once a year. The one thing that does matter is that, when a situation can be remedied by one of your resources, you choose to use it.
I think that's part of the reason that stories tend to only tell you things that matter; resources that don't aid in the story detract from the story.