There are some that doing those thing today. But the news are worsening the bitcoin's reputation they know only about the scams and all the negative things that bitcoin have. They don't even told the mass that it can be use as a source of income without getting scammed.

Television is the best way of promoting bitcoin so people who didnt have knowledge yet will know more about bitcoin especially today that there are some people using the name of bitcoin to scam others that makes bitcoins reputation bad . But first the government of such countries will first allow to implement bitcoin in their place so people will also believe the existence and the concept of bitcoin . And when that happens , their are lots of investors that are going to invest in bitcoin and there will be no more scarcity especially those third world countries or let me say less fortunates . I hope this will be going to happen in very near future.

Bitcoin is not a brand that's why. And it can cost lot of money, like over 100k $ for a 30 seconds video. Who is going to pay ? The minners? You?
Advertising on TV or any other place, is all about ROI. Wich brand is going to advertise on TV for a zero ROI return. Waste of money.