Did a quick calculation of BCH+BSV+BTG and came up with a bit over 2.5% ($875 at the time) and then just figured the dozens of the other crap forks would add together to get to about the same.
My estimate for the value of the other crap forks is "close to zero". Many don't have a working wallet, decent exchange, or trading volume.
Anyway, the main reason I can see needing it is to prove you have "been in the game" for a while.
Trying to impress the newbies so to speak. If it's for a scam or just to posture would have to be seen.
That's why
I assumed taxes or money laundering. Let's set an extreme example: say you sold a stolen fighter jet to a terrorist group for a million dollars in Bitcoin, and you want to use the money to buy a house. You'll get questions you can't answer! But if you sell 25 Bitcoins that haven't been moved for 10 years and buy a house, you can answer any questions from authorities by claiming you received the 25 Bitcoin when you sold an old laptop in 2011.