Gambling is the key to your answer as I don't see any other alternative to earn bitcoins fast, and if you have a good strategy and if you know on which you are betting then you can surely make some money at the end of the day If I have to earn bitcoins fast then I would surely go for gambling.
gambling is not profitable, besides its risky to try one, luck is always a factor either you'll win or not.. perhaps trying other alternative earnings here in the site is good, but not fast..
