1) I'm not a manager; I don't get to decide how to spend my time. Projects get given to me and I do the best I can with them. Training is not really part of my job description; so I'd have to do training for free after hours. I don't mind teaching, but doing it for free after a long day's work, knowing it will benefit my employer more than it will me, doesn't seem all that fair to me.

I'm certainly not suggesting doing it for for free :-) But it might be worth proposing it to your manager and getting them to pay you to do it instead