You usually elect people when you want someone to actively go round doing things - hence having a manifesto and getting a 'mandate' to take certain actions. However, moderating a forum is a more like the judiciary - trying to have a fair and agreed set of rules that can be applied impartially, keeping a stable and consistent environment that people can choose to come and use, having a designated person who has a general responsibility for policing the place and settling disputes. This isn't really a role that lends itself to competative and "sectarian" (ie party political) elections and the position isn't really the same kind of 'decision making power' that members of a legislative or executive have. People should be careful when talking about democracy to not forget the importance of fairness, impartiality and justice - and never forget that to even have elections you will always need someone to organise and oversee the elections in the first place.
Wooo - I am having "theory" withdrawal symptoms... better get back to the right folder eh?