europeforvisitors - 3:30 am on Mar 9, 2005 (gmt 0)

Earnings swings of more then 15% daily are a big no no. I supply a large chunk of my ad space inventory for this type of ads and i expect steady earning (+-15% max).

You sound like a good candidate for a CPM option. Maybe Google and Yahoo will offer that to smaller publishers at some point, as Google (dunno about Yahoo) already does with some premium partners. The downside of a CPM deal is that the ad network has to build in an "insurance factor" to cover itself if PPC revenues drop.

In the end, risk and rewards tend to go together. That's why affiliate sales can pay more than PPC does, and PPC can pay better than CPM.