I’ve wondered this for a long time, and another thread reminded me to ask.
Since there are so many posters, how do you go about inviting someone to moderate? Or do they put in an application? What are you looking for, what do you see? What is that whole process about, anyway?
Mods are chosen for the goodness in their heart,
For having a grasp on fine entertainment and art,
something something something something that rhymes with art.
Now be prepared for about 15 responses which are bon mots approximately as witty as “Russian roulette.” 
Who is bon mot and why is he being made a moderator? I’ve never even heard of him.
I’ll have a go.
*A Russian starship navigator was captured by two Klingons who claimed he was spying.
The Klingons bragged to their captive about Klingon strength and machismo. Finally the Russian said, “That’s not so tough. In Russia we’re so tough we play Russian Roulette instead of poker.”
The Klingons were fascinated by the navigator’s description of the “sport”.
“That is indeed an exhilarating sport and an honorable death for the losers. Do you think you can teach us this game if we untie your hands?”, asked the leader.
Seeing an opportunity to get his hands free and on a phasor, the young navigator agreed. He reached for his phasor in the stack of his confiscated goods but was stopped by a rough Klingon hand.
“Wait!” The Klingon grinned. “You’re trying to trick us. Well we’re too smart for you. I’ll go first!” Whereupon, to the Russian’s amazement the Klingon idiot pointed the blaster to his head and fired.
As the headless corpse fell to the ground, the Russian lunged for the fallen weapon. But alas, he was not fast enough. His arm was rudely twisted behind his back by the second Klingon who leaned forward and took the blaster from his fallen comrade’s hand. Laughing menacing, the second Klingon said, “Hah! I am not so stupid as you think. I know how this works. Now it’s my turn!”*
There’s an application one fills out. I did once but never heard anything back.
It happens.