Don't take this as an official answer, but Rotation servers never worked out for EGO for the time I have been here. They always sit empty, and to quote The Drunken Sailor, "An empty server is just like burning a $100 bill." Having a certain map on all the time makes people want to play. 24/7 Servers are always ranked higher than rotation. (most of the time..) By being ranked in the top 5, people notice us. More people want to join a clan that is higher ranked and well known in the gaming community, therefor we get more members. And more members = more donations and more cash. More cash = more servers and games supported by us. Being on top also attracts sponsors for our raffles, and raffles mean more money donated to the clan. So if we have awesome gear like routers and headsets, then more people will donate to try and win the prize.
I hope this answers your question.