Why buy a cow if you can get the milk for free

Milk the cow that standeth still

I don't care how many pails of milk I lose, as long as I don't lose the cow

Milk the cow, but do not pull off the udder.

That, of course, is the question. Why buy the cow when you can have the milk? Or the house when you can just rent?

I can't say I hate cats, but holy cow, dogs are a horse of another color.