Wow, I don't want to get into the whole poll discussion again, but that 60% is meaningless. What is meaningful is that there were 448 people that at one time had a reservation. Obviously, some of those cancelled long ago, and some may have cancelled recently, furthermore, some of them have been "unresponsive" and have not confirmed. All we know is that there are (448 or less) people that have been contacted to configure.
The other interesting number is those that have actually confirmed: 27.
The worse possible scenario is that 448 people were asked to configure and only 27 actually configured, putting the actual percentage at 6%.
So the real-world value is likely between 6% and 60%. How useful is that?