No, they are not worth anything, please send me the .375 h&H cases forthwith.
Seriously though, the bright nickel cases are rumored to have shorter case life than the brass, but they'll still be worth five or 7 bucks or so for 20 assuming once fired; just give your 30'06 to a buddy. Hell, you're best off just giving them all to people who use them and make friends.
If you thought you were rich, think again.
P.S. I think timberpig's math is a smidgen off. $32/50 brand new doesn't equal 15 or 20 for 20 once fired.