Exactly, everyone uses different pricing models which allow them to create their own individual valuation of the security.  I still don't believe that the market has agreed on the pricing for this asset yet.  Although it is a depleting asset (which, according to the issuer, should result in a price of 0 upon expiration in December), any amount of hash power which is backed by the security still has value at the time of expiration.  With the value of the underlying asset not diminishing to 0, but the value of the asset "diminishing" to 0, is the current value of the share a) the amount of btc that each share will mine between now and expiration or b) the amount of btc that the asset will generate over it's entire lifetime with a theta burn similar to what is experienced in options (this would be with a Dec expiration)?