I used to play {rp} games a lot.  I know there were some other strategic players that did as well.  Ruthless Bastard, Noobschool, Gnullbegg, GOATFINGER come to mind (in addition to Apollo and Miyagi mentioned).  I used to have about 4-5 different rp ones going.  Even Fizzer played in some with us, and myhand.
Here are some examples:
https://www.warlight.net/MultiPlayer?GameID=3008072https://www.warlight.net/MultiPlayer?GameID=3067690
https://www.warlight.net/MultiPlayer?GameID=2996556I have not seen any diplomacy ones in a LONG time (don't think I have played one in 3+ years).  Are they glorified lotto games like mentioned in this thread above, or are they quality ones like the 3 I posted here?
Anyway, to the original point of lacking hierarchies, I run WG and we are a strategic clan.  But, we vote on everything.  I am more of the speaker of the house if you will.  I think that keeps everyone involved and invested in the clan doing well.