How Does a Sudden Decrease in Difficulty Affect the Used ASIC Market?

A sudden decrease in difficulty, caused by miners leaving the network, can temporarily increase the profitability of the remaining and used ASICs. This spike in profitability can lead to a surge in demand and price for used, less efficient ASICs, as they become profitable again at the lower difficulty.

However, this is often short-lived as the difficulty will eventually adjust upwards again.