Black Friday is used to dump loss leaders, over runs and special order low function items that look like more expensive products. I have yet to ever buy anything offered on these sales.
Edit: There's plenty of info available regarding my statement. Here's a few links.
1. https://marketrealist.com/consumer/are-black-friday-tvs-lowe...
2. https://www.forbes.com/sites/benzingainsights/2012/11/21/why...
3. https://www.businessinsider.com/black-friday-insider-secrets...