Shall stick with PPC.
One of the secret of successful IMer is PPC.
They raked in millions of dollars from PPC. I have seen live!
The main reason is with PPC,you can generate traffic from any niche easily and immediately without even setting up your site for slow SEO progress.
Bear in mind, PPC is a deadly game, chances of survival is low but once you master it, you can have arbitrage income for the rest of your life.
Btw, are you using Adwords?