Reveal the answer (my personal answer):

Open-ended thinking, let's see if this is the case.

Lost 50 of principal + received 100 in counterfeit bills, then gave out 30 in change + the 20 in profit that should have been yours, total loss is 100.

Many people might think:

You only actually lost 50 + 30 = 80 of principal, but here you ignored one fact: if you received real bills, that 20 profit would become your new principal.

Let's apply this to crypto.

This is like buying a fake token Pixiu in the primary market
(assuming the fake token price mimics the real token's chart)

The first batch of principal, 50U, is lost

The profit of 20U that you should have gotten from the real token is gone
(if it were tokens at the correct smart contract address)

The subsequent 30U of averaging in is also gone

So isn't that a total loss of 100U, if you were holding the real token?

Some might say,
But you can't sell the fake Pixiu token at 70 either, that's true, but because in the end you're holding a fake Pixiu token worth 100, if it were a real token, you could immediately swap it for 100U. But with the fake Pixiu token, you just can't sell it, same as you can't spend counterfeit bills in real life—the result is the same.

A small example hides a big secret, hahaha.

Token trading skills, adversity quotient, intelligence quotient, emotional quotient—what a set of quotients 😄