If you can only view them in direct sunlight or with a bright flashlight I wouldn't worry about it. If you go without screen protection you run the risk of getting the screen scratched.
What are you looking to accomplish by polling others? Scratches can and do happen. No screen is unscratchable and any material harder than the screen will scratch it. Some have scratches, some do not. Don't overlook prior threads.
I don't have a screen protector, and mine is still flawless even in bright light. I keep mine in a pouch any time it is not actively being used, never in a pocket or out where anything else can touch it.