You don’t need marketing. No you really don’t.
You also don’t need pants when going outside during the winter.
No you don’t, but having a nice pair of warm pants on might be nice, even if just to stop you from dying.
You will surely fare without any pants for a while, you might even enjoy the cold breeze whistling soothingly around your private parts. At least for a while. But given enough time, probably less time than you thought, you will start to feel the cold and then the pain will arrive. Soon, very soon from that, if you can’t find the right pair of pants, you will die.
Have you ever tried how hard it is to get pants that fit you when you yourself have none on?
Do you really want to get to that situation in the first place?
Do you really want to get caught with no pants on?
No you really don’t need marketing, but do you really want to be without any.