Most clubs do it i think you'll find.
It's a common misconception that the category is set by police. It isn't - police categorise games based on risk, the club categorisation is based on anticipated demand.
Sent from my SM-G920F using Tapatalk
As for the survey itself, it's not the greatest to complete but as long as they use the results it should still be valuable.
Sadly, all we ever hear from the club is how ****ing wonderful everything is, rather than recognising that there are things that could be improved. Queuing, catering etc...