Good question, 'Belle.
Brokerage fees are earned by putting deals together. The idea that they should get paid less to put deals together for clients lacking buying power isn't novel, but it is interesting - why wouldn't agents get paid MORE for this?
Think about it. If you're an easy $600,000 buyer, then an agent can put a deal together and earn their "normal" amount.
But if you're a tough $640,000 buyer, don't they deserve a premium for getting you a deal?