Using them in class changes the value of the purchase
Real dance shoes are functional equipment: Many models make it easier for your foot to roll through each step and support controlled turns on suitable floors. This can feel comfortable in class, but it does not replace weight shifts or a sense of rhythm. A dance shoe will not take a step for you. So they are not a necessary ticket for learning a few basic steps.
The difference between buying shoes just for the ball and buying them while taking an ongoing course is repeated use. If you practice regularly, you experience the same shoes while walking, turning and stopping. You get to know how they feel on the floor before dancing in formal clothes on a more crowded floor. By contrast, if you only attend a short introduction and want to dance along occasionally on the night of the ball, the added benefit remains limited.
A specialty shoe also changes a familiar feeling at first. A foot that suddenly turns more easily can feel unusual at the beginning. So a pair worn for the first time on the night of the ball is not automatically an advantage. If you book your graduation ball dance course for your year group, you do not need to decide about buying shoes right away: your actual experience in class gives you a better basis for that decision.


