Sorry, didn't meant to hijack your topic, just clarified meself.
Looking over the posts, one could say that players want to:
-Be able to create and use custom content (buildings and books, tools, weapons etc. This would require a lot of communication between game devs and community, generates a lot of trouble and most likely legal issues. Then again - magitech airships might be worth the trouble

)
-Influence the metaplot/history/feeling of the world (aka the non-static world. Partially implemented in eg. EVE and others)
-Take part in epic action as well as roleplay
May I ask why you're interested?