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Most AM's fall somewhere between wannabes and full time AM's so the number will also fall between these two extremes.
It's not as easy as most people think to make STEADY money as an affiliate... it takes a lot of work and marketing money.
I have been a "full time" affiliate since 2000, meaning that I quit my day job and haven't looked back since. It's not that easy, there are a lot of highs and lows.
I'd say that anyone who is willing to work hard at either building websites or paid adverts can make money, the others just get lucky and it usually doesn't last.