I'm guessing headcount refers to hired interview partners paid on a per job basis.

napkin guess... i assume the contractors are mainly for the 1:1 interviews... there are about 80-125 of them per month based off that revenue and i assume that some that buy the course don't do the one on one interview. the interviewers are probably paid something like 100 bucks an interview if i had to guess(I am not part of their site just basing it off their pricing)

so anywhere from 27000-22500 after contractor fees but then you have hosting and other fees to contend with.