The importance of awareness
a couple years back one was right smack in my face and i didn't recognize it. albumbase.com was a free music download site.
they had literally everything i wanted. to download the music you needed to be a registered user. but to complete the registration you had to sign up for 3 offers, i'd pay good money to know what he made off that site, but at the time i didn't realize that those were cpa offers, i was just looking for ways to bypass them, but eventually i signed up for them and got my music.
lesson learned: always look for ways to "tease" users, then give them what they want AFTER they complete the offer.