In a group export, you can see how many people have ordered multiple tickets, cross-referenced by which pool. Within the export, you can see how your fans behave with certain pools. For example, below, you can see that people buy multiple tickets from pool 1 (here 4 people buy 9 tickets), but that no one buys more than 1 ticket from pools 2 and 3. Below you can see the table 'Attendees', and how many tickets purchased per pool per visitor.