1968 Porsche, low-end model? 300k. Dakar winning motorcycle? 15k.
Steel Rolex with scratches? 30k. Early digital quartz watches? 300.
Personally I am waiting for a few things to blow up. Palm Treo and Blackberry phones, Nokia fashion phones (think 7260), and weird Sony cameras (dsc-f828). Immensely hard to predict, but fun nonetheless.
https://www.usatoday.com/story/money/2023/09/15/vhs-tapes-cl...
https://www.ebay.com/str/wunderbid lists many VHS tapes for $1000s. But when I look into the past sales I see any price over $1000 is crossed through (best price accepted, not the asking price). Still some VHS went for $300-$600.
Apparently old video game things are going nuts, too. My brother says our family's beat-up copy of Earthbound is worth $300. The old Virtual Boy my other brother picked up for $30 could probably be sold for more than $500 (because it's still in it's original beat-up box). Apparently an old tube TV we have in such demand by video game collectors that the model is hard to find now.
The moral of the story: check eBay when you're getting rid of your old junk.