In reply to Cailean Harker:
I know it isn't very helpful, but it's a bit of a 'how long is a bit of string' question.
It is of course very possible to make a living as an MIA, but many things make up how easy it is.
Are you fixed on wanting to teach MIA stuff, I decided it wasn't worth the outlay and wasn't quite the type of work I wanted and went in teh direction on IML instead.