Man...I remember when .03 btc difference (1.18 to 1.21) wasn't that big a deal. But now it's $500-$600. The old ratios for buying these Casascius and any coins for that matter, are changing fast. I offered 1.25 btc for a Cas just the other day. Thank god the seller didn't accept. That is way too much now.
Lol "that seller" here
At least I have an answer now. Im confused at what kind of premium would even be worth it now?
Given that a 1BTC coin will be physically worth 1.1, I can't see 1.2 being a bad offer.