Think of it like a restaurant, that sells hot dogs (studios) and basically only hot dogs. Due to budgeting, they decide to sell hot dog certificates (points) good for 2020 and they will only accept reservations and food orders from people who pre purchased certificates. They calculate that if they fill every seat in the place, every day, and everyone buys a hot dog, they will need to sell 10000 hot dog certificates as that as how many hot dogs they could serve in a year. Only the owner, he wants more money than 10000 certificates, so he adds a prime dry aged steak to the menu. Instead of making it have its own certificate, he says its worth 20 hot dog certificates. He prebuys his 10000 hot dogs, and adds 100 steaks to his order. He also sells an extra 2000 hot dog certificates to account for the steaks In theory, he has the perfect amount of food, to match the 12000 certificates he has sold.
But this is a hot dog restaurant, no one orders the steak. So 12000 hot dog certificates are out there, but he only owns 10000 hot dogs. Bottom line is that 2000 people who bought certificates expecting hot dogs, won't be able to order any because availability is gone.