I remember when GMs on this site first became a thing. Now I'm gonna say a few things, even though I'm late to this party.
First of all, is there really enough traffic to this game that really makes it necessary to have GMs? A lot of us know that we're hanging onto this sinking ship and hoping that we all have some fun at this party before we all go under. A lot of instances where people think GM's are necessary seem to be when they're griping and crying that things aren't going how they want or that someone stole someone else's toy.
Second, being a GM isn't someone who just mediates other people's issues. The hard thing about being a GM is that you're likely not going to be people's friends when you have to tell them that they can't have what they want. But I guess the same thing could be said about mods. A GM should be there to set the mood for an event or arena. They should post what's going on prior to everyone else showing up at the place and post the setting, that way people can get more immersed in the RP. Then after that, they should basically disappear and only re-appear if people have concerns/questions about what's going on in the fight/event.
Third, GMs can't be everywhere at once. They have their own lives to deal with, and there is a lot to keep track of as far as RPs go. One way to remedy this is, instead of just making one or two new GMs, appoint a lot of competent people as GMs and have GMs be assigned towns. Each GM or team of GMs can be assigned a certain village to watch over and keep tabs on as far as RP goes. The zones are where all GMs would be able to watch and can keep tabs on (unless a party asks for a specific GM to observe and set the stage for them via PM). So that brings up the question of who to 'hire' and how to come to that conclusion.
That's my opinion on the whole GM thing. And another thing is that GMs shouldn't help themselves or their other characters cheat. Because once people start abusing power, everyone starts pointing fingers and blaming the people in charge. Then no one's happy.