Unclear about who does errands ....................................Convoy

That would perhaps be a beautician, it is quite common that they have people advertising for them. I did a bit of that myself during my early days almost two years ago. I got a fixed % of how much the ones I brought there spent.

Same with crafters, I know some of the high-end crafters hire people to take care of the selling.

 

High-end 'runners' are sometimes needed by uber hunters. Many uber-hunters are freelancers - they play solo most of the time, but even they can't always take-on say 4, 5 'hard' creatures at the same time, so they will often ask a 'runner' to litterally run at a mob to get it to run towards the uber hunter...

 

Combat medic? Just stand behind the hunter fapping, not that hard? I'm sure you can figure out that yourself without a mentor.

However, as a hunter it is quite easy finding a fapper to which you only need to pay fap decay, so you will probably have a hard time finding a hunter ready to pay an extra fee on top of that.

I would say you need a Modified or Improved Fap to be able to make any money on a regular basis. And we all know how incredibly high price tags those two items have got...
Perhaps also running a medic service with Adjusted Fap would be able to bring in some money (but I already know of at least one running Adj Fap service where you as the hunter only pay him for the decay, plus the Adj Fap ain't very cheap either)