I have always laughed when a trader has $2,000 and asks broker for lowest fees. Money talks, broker knows guy who has 2k going to hog his time, whereas million dollar account most likely experienced and will trade size, guess what, more services and lower fees will be given.
There were couple brokers some thirty years ago who would tailcoat good traders orders to the floor. I rather pay higher commissions for better service, tighter spreads and when I call they answer and not left on hold for 20 minutes. Account size matters.