The market for a $2 million house is going to be much smaller than for a $100k house. That big ass house can sit on the market for a lot longer, and have much pickier buyers. Houses like that also get a LOT more marketing. Would you spend 6 months unpaid working for a $3000 commission, or would you rather only list cheap houses that turn around more quickly for the same price?
Besides, if you can afford a $2MM house, please don't tell me you'd also be crying about paying a percentage.
I still think you're describing hourly work for the challenges of selling a $2MM house. Charge the seller hourly for open houses, pass through marketing expenses, etc.
At least I think we can agree that buyers and sellers should have choices! Today it is difficult to find anyone who doesn't play by the 6% rule, and realtors like keeping it that way.
Besides, if you can afford a $2MM house, please don't tell me you'd also be crying about paying a percentage.