No. Value is determined by what potential customers are ready, willing, and able to pay on an open market, so where you live and housing demand are what determine housing prices. If no one buys a commodity then the price drops. The same house in Detroit Michigan would probably get at least 10 times as much on Long Island New York.
The real estate commission is determined by the listing contract and is subject to negotiation between the seller and the prospective listing agent. A commission of 6% is typical, but to say the "standard" rate is 6% violates the Sherman Anti-Trust Law. A flat fee might benefit sellers of higher priced homes while providing little incentive for the agents to sell. For example a 6% commission on a $50,000 house is $3000, while a 6% commission on a $250,000 house is $15,000. If a flat rate is set at $4000, the seller of the lower price house comparatively pays more while the seller of the higher priced house pays less.
While it would be naive to think that the real estate commission does not end up factored into the price of a home at some point, it is generally a minor part of the home price. Also keep in mind that people are not required to hire the services of a realtor to buy or sell real property, and those "for sale by owner"sales are also factored into area market values.