You've just stumbled on one of google's business models: there are millions of new ideas every day, those turn into many thousands of startups, majority of those think that google advertising is the way to get the word out... each of them spends a few hundred dollars (at best...at worst, some of them spend many thousands of dollars) on Google... and shortly afterwards they go out of business. And this repeats every day.
The winner in all this? Google. Heck, they don't even have to care about repeat customers to make moneh every day.