Because washing your hands after you scarf a bag of Cheetos is such a hassle:
"For Chips, Popcorn, Pizza, Party food, Finger food, Appetizers and anything else that makes your fingers Cheesy, Greasy or Sticky. Designed to go on and off with ease, our unique shape fits comfortably on any size fingertip. Food-Grade Silicone is easy to clean, Dishwasher safe, and can be placed in boiling water to Disinfect. Use as a Finger Food Utensil or for Kitchen Prep.?
They're available in a variety of colors for $9 from Amazon: Finger Covers for Cheesy, Greasy, Sticky Fingers