Again, you can't comp a limited supply vs an unlimited supply. Here's an example...
Lets say "Item A" has 100 units available and all of them get sold and "Item B" has 100 units available and all of them get sold, but 1000 people wanted Item A and only 200 people wanted Item B. Based on sales, it might look like they're equal but that's because the limited supply was within the demand range for both items.
Now let's say the supply number is 10,000 units for both. Supply outstrips demand so now you'll see just how many people actually want the product.
This is the difference between the concert tours and the films.