I paid at the auction 1,55
BTC and the coin as every coin is numbered and are unique so thats the main reason
A little food for thought:
It seems that, not matter how much some people are wishing to price things in bitcoin within the Bitcoin community, the reality so far seems to go the other way. I don't know when you bought this coin, but my guess is the bitcoin exchange rate at this date was much lower, and if you want to get a good estimate of a realistic selling price, you should rather consider the price of the coin in fiat currency (only the premium part, obviously, I'm not talking about the loaded BTC).
As an example, there was a similar auction recently for the higher end version of this coin (gold plated), and the premium of number 4 was 0.24
BTC (1 BTC was worth 900 USD at the time...):
https://bitcointalk.org/index.php?topic=1734740.0Just my opinion, I may be wrong. Another explanation could be the market of physical crypto coins is not in a good shape at the moment, and price are low.
Good luck with your sale