Not getting multi-kid / family discounts!!

Everywhere we go, we see "family" rates for museums, theme parks and attractions. One kid or more than one kid, they all cost the same! How often do you hear, "Get a family three-pack of tickets..." Uh..never? Even health insurance is the same price whether you have 1 kid or 10!

Any one and done families know anywhere you get discounts for bringing just one kid?