I think you funadmentally misunderstand the term 'scalper'. Sorry.
Scalping is buying up stock of brand new sought-after items which are in demand at the time, sometimes using illicit mechanisms to do it such as bots... and then immediately seeking to sell them on at a huge markup from retail price taking advantage of the fact that nobody can get them and they are willing to pay that premium.
"scalpers" often have quite a small window of opportunity as once the retailer manages to get a decent flow of stock replenishment people can obtain the item at retail price and not have to pay scalpers a premium.
Selling a years-old laptop for whatever price... is definitely NOT scalping.
Why do you resent someone selling something and getting a good price for it?