This is ABSOLUTELY not true. I have first hand experience making quite a bit of money with collectible christmas ornaments. This is niche that pays 30-40 cents. BUT, people who collect ornaments click EVERY ad. I'm pretty sure this is a case with all collectors' topics, where goods are in short supply. People who collect stuff are insane. They click every ad, visit every site, write thousands of e-mails talking to other nuts like them all over the globe. You can make decent money for topics that aren't "hot".