PPC Search Arbitrage Come Back?

If you didn't know what's PPC Search Arbitrage, you could read Jake Baillie's post in 2006, in which you could even find out the history of PPC search arbitrage. In short PPC arbitrage means sending mass traffic in low price to your landing page placing AD from other advertiser with higher CTR, your profit comes from the  margin between outgoing ppc * revshare * CTR and source PPC.
Maybe you notice it's so profitable as for you can easy expand your input and get more revenue. But the most important is how to find the difference between different advertisers and the second are insuring the CTR of your landing page.
Some internet magnate, including Yahoo Shopping, CNet, Shopping.com, Verizon, Info.com, PriceGrabber, NextTag, eBay, etc. take part in PPC search arbitrage too. Off course that they have blotted out in their real business model.
But PPC search arbitrage infract Google's policy and profit, so Google forbid similar operation in 2006 and in this year many AdWords accounts were banned. For someone, PPC arbitrage is died in 2006.
Is it true?
Just after two years, Danny Sullivan find Ask.com Plays The Google AdWords Arbitrage Game in 2008, so PPC arbitrage still alive and Google just say no to smaller business owner.
Ask.com is not the only example, Info.com begin to follow it, let's review below Info.com's landing page.

How about? It's unassailable MFA site.
But I don't suggest you follow those operation, if you have ability that finding keyword with low cost and high conversion rate, why not try CPA? it's more profitable and safe.