I've never actually heard of someone doing AMV commissions! I mean...it's been a long time since I've really watched AMVs. In the early 2000s it was just a hobby of people who had editing skills as those were the only ones who could afford video editing programs/the know how of ripping videos from VHS tapes.
I did make some really terrible WMM AMVS back in they day, but I relegate that to an era gone by even if I do know some people make some still. (As well the fact youtube content id hits both footage and music, it would probably make it difficult to dedicate much time to it.)
In terms of this particular fourm, I do not know of anyone recently who has a gallery that showcases their editing capabilities, so I don't think AMV requests would get traction here. In this current age an person who has the skill to edit a good AMV could easily get a job as an editor for various youtube channels, so AMVs would probably just be a hobby for them.