The supermarket sells various kinds of fancy butter, but why don't people eat whipped cream instead? Let's normalize to 100 calorie servings and compare prices:

• Plain Butter, store brand: $0.10
• Heavy Whipping Cream, store brand: $0.20
• Fancy butter, Kerrygold brand: $0.30

Perhaps the reason people don't normally use whipped cream is that whipping it is too much trouble? If you use a manual eggbeater in a standard sixteen ounce deli cup it takes about fifteen seconds (youtube) for a serving.

Alternatively, maybe people think whipped cream has to have sugar in it? This one is simple: whipped cream should not have sugar in it. If you're eating whipped cream on something sweet it doesn't need sugar because the other thing is sweet, while if you're having it on something savory it doesn't need sugar because that would taste funny.

I'm sure I'm missing something, but I'm very happy over here eating whipped cream.