As someone who has been an SLI for long periods of time, and flown the line for extended periods. SLI is not some unicorn/best way to make money deal. If you want max money; it is out on the line!
SLI can not WS or QS while teaching. There are no Premium Sim pickups. You can GS while teaching, but you are at the OBGS rung of coverage. Also, those overrides for PCP and APD are per month, not per event!

also, our pay pales in comparison to UA and AA. You can check the Contract Comparison.

as someone who’s seen bad instruction on various fleets. We should want there to be good incentive to attract a talent pool of instructors.