Is it a lack of patience - or is it a lack of motivation, or maybe willingness?
I know a number of people that have a computer, Internet connection, disposable income, time, etc. - everything they need to get started.
Yet just by observing their life habits for a while, it's easy to determine which ones don't have much of a chance of making money online - AdSense or otherwise.
They aren't willing to forgo a few hours of watching sitcoms, to stay home with a sandwich while working instead of going out and spending an hour or more over a restaurant meal, to sacrifice attending the social event of the day, etc.