Hey,
Do you know what the most valuable information you can ever get in marketing is?
It's the private advertising statistics of your competitors.
I'm not saying it would be morally right to do this - but If you could hack in to the private advertising accounts of all the other business's in your niche, and see what they spend, where they spend it, and what results they get... that information alone would be worth millions.
Possibly a lot more, depending on what level you're operating at.
Why is this information so valuable?
Normally, for every 10 traffic sources you test, you'll be lucky if 2 are profitable