Nooo... forget tubes and acai get yourself a nice mmorpg game script and start an online game, get those teenagers spending anything from $1.00 to $10.00 via paypal or mobile phone. Let the users play the basic game for free and charge them for credits or power packs to open up the full game. If you have ever played an online text based mafia game you will know what I mean
You can make up all sorts of weapons, power packs..ect and the users will buy it.