I can manage many reponsibilites and the servers that I am Admin on are relativley low problem servers. Occasionally when I log on I have to do a quick "/co rollback" and a ban for greifing, but that is only occasionally. Also, the servers used to be 150 slot servers, but in 4 days the server has died a little because I was not active (my computers harddrive crashed so I had to buy a new one). So now the servers are down to lower player slots to account for the smaller playerbase... unfortunately we will probably shut one of the servers down.
As for the other server I Admin, I am admin with 4-5 other people and it is also a low-problem server. It is a PvP server so I only have to watch the no-cheat and watch the people that are setting it off to make sure no-cheat isn't catching lag.
Plus, I need servers that I can go to to play minecraft away from the responsibilities of an Admin... I am sure all Admin's have 1 or 2 servers that they go to for relaxation. So far I have SurvivalGames, but I want a server like HCO as well to play like a normal Minecrafter.