Hi, yes your calculation is correct. The average/target billing per recruiter is RM50K a month (back at my agency) so about 5K commission but I hit 80- 100K pretty consistently so commission can be pretty solid. We get it upfront (bigger agencies).
If the candidate resigns/didn't pass probation, the client will still have to pay for the fee but they will get a free replacement candidate within the guarantee period (usually 3-6months) - we never sign 6 months though