I have spoken to a couple of exhibition managers (not this event, I've just chosen it as the most recent of the numerous topics where you are copy and pasting the same question) who are wondering what your motives are. Are you representing a club, society or event or closely linked to one? If so a little more openness would probably give you a better response. If not, they're wondering who you are, why you need to know and what you're going to be doing with any information. After all, such information and their bearing on club finances are very much their business.