Cyanide, EQ first started achieving these record numbers after they implemented the Bazaar, a zone in which idle PCs could convert themselves into merchant NPCs that sell to other pcs. There were hundreds upon hundreds (~580, last time I was there) of these idle characters on every server! And just because you thought EQ was long and boring doesn't necessarily mean its subscribers did and played less as a result. They thought it was fun, and they played for stretches of time that would make your average FPS player cringe.
For these reasons (no idle characters, average play period shorter), I'd expect the PS servers to average lower online percentages of their total accounts across the board. I'm also betting, for other reasons, PS will have a lower retention rate than MMORPGs. That's not to say it won't be profitable--it will.
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-Seer
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