They probably just mine different coins with longer block times, which makes it less likely for you to submit a share for a block that is already solved. Terk seems to have calculated that these fast coins are worth mining even with sky-high rejects. Or he's wrong and Wafflepool is doing it right, I don't know.

On a related note, I would also appreciate an EU server. us.clevermining.com seems to be located in Seattle WA, which is simply too far away from me. US East Coast would be at least a little better.

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@tyj8tim: Share difficulty has nothing to do with reject percentage. Or with overall profits, or with anything that matters.