Hello Sparktans! Keeping track of who has purchased something via a checkout page is very beneficial and you can do that by going to:
Left Side Menu Bar > Checkout Pages
Under "Checkout Pages" page, scroll down and click "View Purchases" next to the checkout page you like to check.
After clicking it, a window will pop up and you will see a list of invoice with the names of the students that have purchased, what they purchased, and the date of purchase.
It's a useful way to keep track of Events and who will be attending the Event you created the checkout page for.