Hey, that is a great question.
Rates actually go up to 10% in some places, so the true question isn't about commission.
The true question is this: How do I net the most profit when I sell my home?
The answer is: You will receive market price when the property is properly prepared for market, marketed, correctly, and priced right.
The question about commission is s red herring. I've seen people list their homes for low commission...and they never sell. I've seen people list with above-market commission, and not get the results that they wanted.
You need, as a consumer, to analyze the Realtor's proposal and determine if you believe that their proposal will produce the highest profit for you. A big part of that profit comes from great negotiating, so you should expect that the Realtor you hire can demonstrate great negotiating skills.
If you'd like I'd be happy to refer you to a top Realtor in Buffalo. They will be a great negotiator.