I feel compelled to remind my fellow REALTOR's that a discussion of commissions charged, especially "common", "usual", etc., may fall under Sherman AntiTrust Laws and could cost you money and/or your license. Please be careful when talking commissions. My understanding is that you can say what you charge, but not what someone else does.
According to: Fillmore W. Galaty, Wellington J. Allaway, Robert C. Kyle (2006). Modern Real Estate Practice. Dearborn Real Estate Education, (Chicago, Ill).
"Price-Fixing - Price-fixing is the practice of setting prices for products or services rather than letting competition in the open market establish those prices. In real estate, price-fixing occurs when competing brokers agree to set sales commissions, fees, or management rates. Price-fixing is illegal. Brokers must independently determine commission rates or fees for their own firms only. These decisions must be based on a brokerâ€™s business judgment and revenue requirements without input from other brokers.
Multiple-listing organizations, boards of REALTORS, and other professional organizations may not set fees or commission splits. Nor can they deny membership to brokers based on the fees the brokers charge. Either practice could lead the public to believe that the industry not only sanctions the unethical practice of withholding corporation from certain brokers but also encourages the illegal practice of restricting open-market competition.
The brokerâ€™s, and agentâ€™s, challenge is to avoid even the impression of price-fixing. Hinting to prospective clients that there is a â€œgoing rateâ€ of commission or a â€œnormalâ€ fee implies that rates are, indeed, standardized. The broker must make it clear to clients that the rate stated is only what his or her firm charges."