I suspect that many holders of 10s are unwilling to accept a BTC price lower than what they paid for the coin. This means many are unwilling to let them go for less than 16-18.
I also suspect that the phenomenon of Casascius coins holding their premiums in terms of BTC is over, and that sellers turn down any reasonable offers at their own peril. I expect BTC premiums to continue to drop.
But hey, what do I know?
Lol @ "sellers turn down any reasonable offers at their own peril".
How do you define reasonable? What might the peril be? Stuck with a terribly shiny token for a few more years?
![Tongue](https://bitcointalk.org/Smileys/default/tongue.gif)
It's just a thin market with unmotivated sellers. They have a rare and desirable thing, so they can ask whatever they want, for as long as they want. Maybe a motivated buyer will come along and meet their ask, maybe not. Maybe it sits in storage for a few more years.
I thought that was your coin
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)