My issue is that you can also have picky clientele at $300k, but you don't get paid any more. Or for instance, compare a client who spends every night checking

My issue is that you can also have picky clientele at $300k, but you don't get paid any more. Or for instance, compare a client who spends every night checking Zillow for the latest listings vs. one who relies on the agent for new listings. There may be some correlation between home price and effort, but there are other factors that often dwarf that, and those aren't priced in at all.