I'd agree with that if we were talking about new members. How many senior members are there, and how many want to be a middleman? And of those, how many have 50+ successful trades to achieve the required feedback score? Very few, if any at all. It's not easy, and it's not supposed to be.
EDIT: Liability would not be put on XenoBot. Wasn't it made clear that all trades are conducted at ones own risk? This simply reduces that risk by allowing a community approved individual with a perfect trade history the opportunity to stand out among others.