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Since I first posted, Yahoo seems to have a dramatic flux from high to low. Rev went down the next day, but today seems up again.
I've been doing this long enough with both Adsense and Yahoo to understand the fluxes. Yahoo is either really high or really low. Adsense wavers, but generally stays the same, they don't experience the extremely high rev. like Yahoo (nor the really low, lows).
If Yahoo had the real time channel tracking feature we could figure out how to play this game better :)
(Looks both ways before continuing message...)
I recently purchased a set of "Adsense sites" and decided to put up a second copy on another domain with YPN ads - surprise, the Ad targetting kicked in right away and was showing relevant ads for each topic. YAY!