Quoted from Damonator:

Wait - I can resolve this argument. Dung - you are correct - if you are merely trying to flip a game, then having a max profit cap of $500 to $1000 with a lot of unknowns is dumb.
However! What Hilton is saying is that condition and rarity are king. He said it was worth $3k to him just to upgrade the cosmetics on his game.
I get both sides and both sides are valid depending on perspective.