The simple answer is YES! Like anything worth acheveing, it takes some hard work and putting in quality, study time prior to starting your program. For some good background, view my prior post: Is Your Blog/Website Generating Income?
Many website owners do not think it's worth the time to incorporate Google ads. In most cases they are correct because they looking for that mythical, big bucks for no work scam. For some real-world results, below is what we made just from Google last month:
If you are looking for good information on making money with Google my #1 advice is to listen to information from those who are already making decent money w/Google.; the #2 advice is get a free subscription to my SEO blog so you don't miss our future posts on tips and ideas to make money online.