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There is a higher CTR required to be syndicated, but still a reasonable figure (imho).
The only thing that I wish Google would provide, is a comprehensive list of their partners -> because we have a few here, but there isn't always an 'announcement' afaik.
You can either opt in or opt out of syndication, but you can't 'cherry pick' which partners show your ads, like Ask, Excite, AOL, Go, etc.
To complicate it more, their is no particular way of breaking down which engine a, b, c will use compared to d and e. All i can say is a, b, c are heavy traffic - minimal return, d & e - very good return - minimal traffic.
Obviously knowing search traffic for the engine's as a whole, and the geo usage by country can be targetted for, but 1 user on one engine (say teoma could be a buyer), and ten users on say G could be browsers. Obviously an illustration than a fact, but its very hard to predict via PPC, which is more valuable, hence i list in all knowing that my more competitive kw's will mean less ROI, and more specific kw's mean more on aggregate.