Only because the supply chain has made it so that there are valued way more than they are really worth. I have a few and they're great machines. Although I might have one for sale in their current price. For instance I replaced my 2 GB pie hosting one of my services, to a think center that was cheaper and more capable. Pis are still great machines. It's mostly about the form factor. For anybody reading I have a pi zero and a pi4 2 GB model for sale.