In a world where some people can control toasters with their mind, free gravel disappears as soon as you put a price tag on it. I'm sorry if you don't like that, but I don't make the rules.
The original question also doesn't state that gravity attracts everything but oysters or that Albert Einstein has two runny noses. But that's how it is. These are just the basic rules of the fantasy pill world. Everybody knows that (at least I thought so).