This is interesting....

 From the official Oktoberfest Web Site:

... "For the first time, hosts will have online portals where unused reservations can be exchanged or sold at the original price. An important step to push back the gray market, where thousands of euros were often asked for a table. 20 medium-sized and large gastronomic businesses have already opted for the Oktoberfest-Booking.com portal as a solution."