Scalpers enter and exit trades quickly, usually within seconds, placing large trades in the hopes of profiting from small price changes.
www.investopedia.com
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"A scalper, in the context of market supply-demand theory, also refers to a person who buys large quantities of in-demand items, such as new electronics or event tickets, at regular price, hoping that the items sell out. The scalper then resells the items at a higher price".
Of course GPUs can be scalped. That's the only way to buy them anymore; from a scalper. You seem to be referring to price gouging. They don't just buy large quantities of in-demand items, they buy ALL of the in-demand items that are for sale. It happens with designer shoes a lot.
During this recent GPU shortage, 99% of everyone who would normally be a gamer turned into a scalper. They said "screw gaming" and went for the $2000 profit from buying up entire Best Buy drops, botting attacks, etc.
en.wikipedia.org
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"Price gouging occurs when a seller increases the prices of goods, services, or commodities to a level much higher than is considered reasonable or fair. Usually, this event occurs after a demand or supply shock. Common examples include price increases of basic necessities after natural disasters".
Price gouging is when people charge $25.00 for a gallon of milk before a hurricane hits.