So as many people already know PPC arbitrage; that is essentially buying cheaper traffic and sending it to higher paying ads and pocketing the difference is still somewhat alive and well...although many of the big networks such as adwords/ysm have changed their guidelines since around 2007...there are still big players in the market that continue to do this via second tier networks and vertical cpm networks. I have already researched various techniques and am working to build my own algorithmic software to do this at scale. Just wondering if anyone is currently doing this on these boards and has any thoughts/input they would like to share? It seems to me to be a purely mathematics oriented problem, if you work with the right networks and pass-backs between ad exchanges you can achieve the required spread. Anyone work with large datasets containing PPC information, bid-spreads and seasonal trends?