small note - finally saw a content creator who does something I've long thought this category of content creators should do (but most don't) - in this case he bought a collection of #mtg cards and made a video looking at what was in the collection (and estimating the value). He paid $400 - turns out the collection is likely worth about $2000 (at retail prices), he's likely to net about $1200 or so selling it via a "buylist" online.
So he is planning on sharing half the profits with the seller