If one has to explain a joke then either they're bad at it, it's a bad joke or they have the wrong audience....I'll leave the conclusion as to which is it to the readers :)

The article is about making money (even from the title)..the commented upon line is insinuating that if you think the article isn't for you (ie you just randomly stumbled upon it), then you obviously are not interested in making money...sarcasm :)