PPC Buys Vs. Bulk Traffic Vs. Banner Taffic

Has anyone ever done a complete analysys of their traffic buys...
Evaluting which was the best productive for them?

It would be curious to know if certain types of traffic worked best
for certain sites... i.e. PPC best for retail, Bulk Traffic best for Consoles,
Banners best for Pay sites... etc.

I'm sort of inclined toward...

PPC good for retail
Banners good for paysites
Bulk good for free sites, link lists, etc.

PPC performs best on Cost and ROI basis for this mix for us.

Most of the media buys we have done over the years have never really correlated in to any significant stats other than print campaigns not really doing well for us.

As with any type of traffic though, everyone is going to have different results because nobody has the exact same sites and the exact same marketing campaigns.

Regards,

Lee