I think if you are being "told" 8% is "usual", then you are probably dealing with LAND and not a HOME? Cheboygan is NOT Alaska and I even think the Alaskan agent I've seen on here might even take offense. Contact Gary. He's trustworthy (from my experience with him on here) and ethical. I think Gary was "selling" because he was HINTING that you might be getting taken advantage of. Or maybe 8% is "usual" for a mobile home but not your typical residential home.
Some areas stay pretty firm at 6%, other areas 5% for full service agents. Some superior agents charge a premium and there are also discount agents. So you could expect commission to range from as little as a couple hundred bucks flat fee to even 10% for something requiring excessive time, money for marketing or such a low price just to make it worth the agents time.
According to Steven Cook, a Vice President of the National Association of Realtors in a letter in May 2007, he said, "All real estate commissions are negotiable and the average is 5.1 percent, according to the most recent available data."
I hope that helps.