These are the questions you must ask yourself in order to answer that question.
Look at it this way: how many business opportunities come your way where the only requirement is hard work and the time it takes to work hard? Not many. Almost any business venture requires some kind of start-up money.
If your total earnings is showing 0.00 after a week, not to worry. Keep reading and learning and working. If however, you're still showing 0.00 after a month, it may be time to implement some of those optimization tips you'll find on the Google Adsense Support Site. Play around with the placement of the ads on your site. Consider changing the colors. Look again at the content. Is it interesting?
|How Much Money Can I Make With Google Adsense|
As with any other business, with the Google Adsense program, the sky is the limit. Work hard. Work smart. Have fun. After all, you're the boss.