100$
0.011BTC
You know its more worth then 0.011 btc. at it was not bound to a specific ether address it was sold at 6175 Enjin Coins worth of ~600 USD, there are only 782 in Total Supply and you can get more from this MFT in special Airdrops from Enjin.
the auction will determine what it is worth for, at the moment. this is a totally different case now. the token is bounded (i.e. I cannot sell it through enjin marketplace) & private key is known to more than 1 person.
Edit: + It will not have any resale value (since no one will accept to purchase a private key that was purchased by someone else in the past).
Edit 2: Even the fact that we are discussing buying a private key, is of a high risk itself (for the buyer)