Can anyone tell me why concentrated antifreeze and prediluted 50/50 antifreeze cost the same? And who would be stupid enough to buy prediluted?

Both are around $12 bucks a gallon. With concentrate, mix it yourself with water and you get 2 gallons for $12 dollars. With 50/50 ready to use, 2 gallons cost $24. You're paying $12 for a gallon of water. IMO, 50/50 should cost half as much, OR concentrate should cost twice as much. 🤷🏻‍♂