Designer watches
Ooo! As a fan of swisswatches dot com YouTube Shorts, I bow to you.

Some watches if kept with boxes and in near perfect condition can fetch a lot of money. And, There value increase with time.
Hah! The expressions on the faces of the puppies below is priceless! Oh, and I am in awe of people who win at those hotdog eating contests. Most of the time, they are thin competitors. I am guessing that they bring up all they've eaten and right into a garbage bin after the contest.
I have a bunch of trading cards that are really rare
Trading cards are cool. As are old original and rare comic books. Have you had any appraised?