Many ATC Instructional Institutes/Academies/Colleges are employing "Contract/Consultant Instructors". The "Contract" lasts for the duration of the ICAO approved course length. This can be 8 weeks for an Approach(P) or Approach(R) course; up to 12 weeks for an Approach Combined Course: similar for Tower; similar for Area.
The pay structure seems to revolve around an allocation of (approx) 50% of and ATCOs salary in the same stream in the location: "Not real aeroplanes = not real pay"?
Then accommodation might be provided... transport arranged.. partner's airfare negotiated.
The cost to the trainee is normally borne by the future (current?) employer.
At a recent "consultancy", the trainees were charged at (equivalent of) USD12k for a 12 week course.
There being 8 of them: USD96k to the training institute.
Instructors paid: $6k/month (untaxed): 2 of; 3 months = $36k
Accommodation: $3k x 3 months = $9k
Transport: $6k total (hire cars)
Incoming to Institute $96k.... costs $51k... bottom line: $45k profit per course.

(I accept: other on-costs exist)
Soooo, up the ante if you choose to apply for an Instructorialship/Consultancy!!
POC