Internet Marketing is tough.
Don't let anyone fool you. While there are tons of theories on what works and what does not, and all of the supposed experts bicker about this like a pack of rabid harpies, there is one thing to which anyone worth their weight in salt will agree. You don't know if you're hitting your target or just shooting blindly into the wind like a mad man. I don't know about you, but I don't like to leave things to chance. Especially not my future.