For me, I think it is not easy to understand the bitcoin. Coz it is so much more complicated than fiat money or with real money. Also, we all know that advertisements are really short and I don't think that a short amount of time can be enough in terms of explaining what bitcoins really are and how they work. And let's face it, advertising on tv, if done on a massive will not much effect because most of all the countries have yet to approve bitcoin.