Im saying that your counter offer for the whole lot( silver set, 4x1btc brass and a 10btc) @ 32 BTC total results in an almost 10btc premium for the 10btc coin alone. This is taking into account your willingness to let the silver set go for 6BTC (which you priced the coins individually for a total of 6.5BTC), and under the assumption that you would do the same for the brass errors (which is realistic Im sure you would agree).
So on the basis that youre getting almost your asking prices for all the other coins, youre wanting 20BTC for a 10BTC Casascius. Surely you bueno now.

Im just saying thats just a bit too dear for me.