I don't think I agree with you. Not all of them, mind you, but as a rule, a $30k preamp WILL be better than an $8k amp. There are plenty of examples out there. Yes, it IS diminishing returns here, but to flat out say a $30k preamp is a sham, and everybody should be happy with an $8k preamp is kinda... well... just doesn't seem right.
alexandre
Not really saying $30k preamps are a sham but what I am saying is that at some point money simply can no longer by small improvements in sound quality. For example, do you think that a million dollar preamp is even a micron better than a $200k preamp? I'd say hell no, state of the art is state of the art and more money cannot make it any better. And i do think $10k can buy a state of the art preamp. Any differences between a superb $10k preamp and a superb $30k preamp I'd chalk up to designer approach and buyer preference and not clear sound quality improvements.