This isn't necessarily true. Scalpers are doing it because they perceive the product will be popular or at least in small enough supply. Also, as others and myself have pointed out before, the launch window is never indicative of lifetime sales. They always do well at launch which is why you have scalpers (make a quick buck on those people that have to have it). They're actions aren't indicative of how actual popular the product is.
Sure launch window doesn't ensure lifetime sales. But if there wasn't demand from even scalped consoles they wouldn't be continuing to scalp even a month after release and we will see lack of availability probably until April.
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"
Azzanation: "PS5 wouldn't sold out at launch without scalpers."