the problem is not about advertising.. its about bitcoin usage once people start thinking about bitcoin..
afterall there is no point wasting money on advertising if the viewers cannot buy beer or toilet roll with it from their local 7eleven.
and thats why europe doesnt bother advertising Euro's in america.. or why america doesnt advertise Dollars in britain...
so will all you "we need to advertise" fanboys. look passed the 15 minutes of fame and orgasms you will have from seeing the advert. and think about the non-bitcoin people who will see the advert for the first time. and what uses they will see of benefit..
I guess awareness about Bitcoin will naturally increase once you have multiple bitcoin companies and they start advertising. It doesn't have to be the Bitcoin foundation (equivalent of America advertising dollars).
If there are telecom companies advertising, it is a positive for the advantages of mobile telephony as a whole.
In the same way, once there are multiple competing companies in the cryptospace and they start spending on advertising, Bitcoin will benefit.