Celestial Seasons FAQ [1] says they sell 1.6 billion cups of tea per year, so this would work out to about 5 grams per serving, which seems around the right ballpark for the entire tea bag. Maybe their thinking is that without the staples, the tea bags are compostable, so they don't go in a landfill?

[1] http://www.celestialseasonings.com/learn-about-us/faqs