Even ad arbitrage can be a net win. If Foxnews buys a native ad on drudge report for a timely article, thats probably a net win for users... but technically, since Fox is supported by ads, its ad arbitrage.

The "viral" and "slideshow forced pageview" sites will never be a net win in my opinion...

but a quality publishers who is ad supported running arbitrage with native can be a net win. (Although, I would quicker call that audience building than straight arbitrage.)

but, I agree. These single click ad arbitrage sites are pure evil and should be kicked off the native networks.