In the early 80s I think they were definitely getting commisions, and I think there was talk here about all the commissions Debbie Cook got when she was in the SO...and bought a fancy car with some of it.
If that is correct. That would be great. At least it is something. However, when I have seen recent videos of Sea Org members being interviewed or COS reps interviewed there is only mention of food and lodgings and a small wage. Maybe the commission has changed. I am not sure why it has not been mentioned in interviews in the last few years. I would be interested.