Buying discount offers when actually needing things is good indeed. One must be lucky and often check prices on suspect dates. I was lucky a few years ago in a pre-xmas sale. This year, offers have not met my need.

While you might be right IN GENERAL, the Black Friday/Cyber Monday/other similar deal periods provide at least SOME excellent deals. I will only speak about two of my own past experiences...
1. Back in 2017, I got the Xiaomi Mi A1 smartphone with about two weeks prior to Black Friday. On BF, I received a voucher for the price difference between my purchase date and the BF deal. The difference was about 10-15% of the phone's launch price and I used it to get an external drive. A very good deal overall.
2. Last year, on BF, I got a hint about a huge discount on a 27-inch monitor, one that I actually needed, I am not into buying deals and then reselling the products for a profit. Its regular price was about 300 USD, I got it for 100. The stock was depleted in about 5 minutes. Never got back to that all-time-low price ever since.

Yeah, looking back at it from the beginning of these so-called deals' campaigns, up to passed Black Friday (that many "deals" are just mirrors from just the regular seasonal offers, and NOT TRUE Black Friday deals), it appears that a great majority of WISE consumers just refuse to purchase any of these so-called deals because by going to these hosted sites, none of these products are even moving out fast, or at all, but instead, many are still plenty in stock.

Who knew?

Maybe, these diluted companies will have better luck with their useless of ink deals ~Super Saturday, huh?! /s