I guess if they are tracking 80% of tickets resold (and make the assumption that this 80% is accurate), you can back into the numbers pretty easily. For exampl

I guess if they are tracking 80% of tickets resold (and make the assumption that this 80% is accurate), you can back into the numbers pretty easily. For example, the table for the Springsteen concert shows that 1540 tickets were resold. Let's assume this was 80% of everything resold, which grosses the total number of tickets resold for this even up to 1925 tickets. Now let's assume that the venue holds 20,000 people (this data is easily attainable - I'm just using 20k for illustration). That means that the other 18,075 tickets were purchased for face (another data point that is easily - albeit tediously - attainable). So really the data is all there - the big assumption that this all hinges on is that the site tracks 80% of all tickets resold.