I have a real business idea and product. I have a huge network to market this to. I have 4 accounts on Twitter with over 1million people reach with a high level of influence. This is a catchy product so I can have a massive amount of people download it initially to start a huge trickle effect.
If everyone tells someone, its easier to sell a boat load of copies if you start out telling a million people instead of doing your own blogging/promo or having a decent size site post a press release about it.