Derivative of "a king's ransom".

A zoomer's ransom is an amount of money which surpasses the normal value of an object due to the perceived value by a zoomer.

The correct value is unknown to a zoomer due to not having an accurate historical context because of their age. A Millennial might knows that the "Duck Hunt Super Mario" for NES is worthless due to experience (seeing several copies in pawn shops for a penny circa 2003 for example) a Zoomer thinks this item is valuable and is willing to pay a Zoomer's ransom for it (for example $50). Their perception is created by Retro Gaming YouTubers and other con artists (also known as reseller scum).
"I could get a zoomer's ransom for that damaged copy of Majora's Mask"

"Oh no, AVGN just did another video about the Dreamcast. It's going to cost a Zoomer's ransom for one now!"

"I paid a zoomers ransom for this copy of Contra on NES. This shouldn't have be more than $10!"
by Frenchpet July 9, 2020
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