I think you should lower your prices a bit. 2.5 BTC for a 2013 brass 1 BTC is a bit much. The prices on your silver coins are way too high as well.
Actually, I already made a few sales. So, you may just as well say that the prices here at Bitcointalk are a bit depressed. Probably, this is because all the original Casascius buyers are still here, creating oversupply. Once you get out into a wider world, you can find more demand.
That being said, I'm open to reasonable counter-offers on most coins via PM - either here or on OpenBazaar.