I like my 2 Rick sketches that I have but I won't be thinking they'd fetch even $400 a piece.
I think it's ridiculous... a lot of people think the sketches from this set are a goldmine and there's way too many character ones to choose from. Some of the S1 cards are still up there for stupid prices and I'll never understand it either. If you want to sell it... just sell it. Don't expect that after 6 months someone is going to buy your card for $800.