If we had direct democracy there wouldn't be anyone to lobby.
If we had an absolute monarchy there wouldn't be anyone who would want or need something from them.
If we had full anarchy there wouldn't an unfair advantage given to some companies via government rules because there would be no government rules.

This is why I think all three systems are better than republican democracy. Republican democracy basically requires corruption in one direction or another to figure out what it's doing. Anytime it tries to persue something new it will do it in the most corrupt way possible.