There's your problem.

If these were "regular" (published) L and/or T fares, you'd be banking ~72,000 MQM/yr. They are obviously unpublished/consolidator fares, hence you're earning 25%, which happens to work out to 18,000 MQM.

Aside from getting a new job or changing your employer's travel policy (many would pay for J on this route), I think you're stuck.