Opted in.
Learned my lesson from the last coin deal. Never opted in thinking it would go for more, and then was stuck with the coin which I had to return (and despite sending it back to the U.S. Mint around 3 weeks ago, still haven't gotten $ back). For me it's better to make the quick $50 and not have to worry about anything than make a potential few hundred bucks but then have to worry about Ebay scams, customer returns, etc.