Television Advertising

My first blog and wow have I got a lot of things to say but like the first thing i want to blog about is Television Advertising. While watching TV as all normal people do we get these advertisements for popular TV shows. my one question is, If a TV show is so popular, why keep advertising it? if it was so popular then people wouldn't forget about it. like we all know Jersey Shore, i mean we all know its on MTV but do you see them advertising it all the time? Because its sooo popular there's no need to advertise Jersey Shore. But ion the other hand, its there to keep people aware that the show still exists and that it hasn't become DEAD like most other shows that Ive seen. But yet again in my own mind i think its a bit stupid but like they say. its just Advertising.