The data does not support the claim that fsbo homes sell for six figures less than homes sold by agents, and that's with buyer's agents illegally trash talking fsbo.
The data doesn't have to. My claim is that a professional marketer can improve your price. You're then claiming from that not having them will reduce the price you get, which is a logical fallacy.
Also note the percentages I gave, it obviously depends on the price of the house.
The problem is their fee is also that much. So it doesn't benefit you to get 6% higher price if you have to pay it to agents. It's just more tax and fees you have to pay on a higher house price.