Very interesting. Ever try setting up an affiliate account with Amazon and pushing products on your own site for a percentage of each sale? Probably a little more work and patience though, since your income is dependent on sales of products you're linked to. Still, a realistic way to earn some extra cash without a ton of effort (initial set up takes the most time), and if you're savvy with seo marketing and backlinking you can drive traffic to these products via your own site for little or no cost. Then pick up with the ppc ads if and when you start making some sales.
I'm eager to try your method though. Just thought I'd share something that has similar potential and has started to work out for me.
Thanks again for the post!
-N