In a sense, there is. If you get enough students to pass
checkrides, you become a "Master CFI".

A meaningless, political designation, IMO. That's a NAFI program and
there are some other requirements to it, as I recall. Sorta like a
Boy Scout merit badge. ;-)

Anybody can download the TERPS manual and read it. Not quite the
same as attending a training class, but you get a whole lot more than
you'd find in the AIM.

I acquired a copy as an instrument student and I use it regularly.
Useful, but it would take an expert to be able to say how the criteria
are applied in the real world.