Apparently Mr. Pass does not agree. I don't think the diamond vs. CZ comparison is appropriate. A diamond has nothing but its structure, imperfections, and social status that make it what it is. A circuit given to a reasonably competent builder can be just as good sonically as "the real thing".
Mr. Pass does not personally build all his amps at Pass Labs. Guess who does? A bunch of competent builders working from a circuit diagram from the brain of the man himself.
Here are his clipped comments from the DIY thread:
While I have made some clarifying statements regarding policy in the past,
I don't think they reveal my true motivation.
Sure, the odd kitchen entrepreneur makes a knockoff of one of my designs.
The problem is that he uses my trademarks to promote the sale.
Does this cost me the sale of an amplifier because the customer bought the
knock-off? Probably not.
What it costs me is the ability to market through quality distribution in many
places because distributors look at the knock-offs as degrading the value of
the original in the marketplace. The good distributor in Asia or Europe and
even the good dealer in the U.S. will complain that business is tough enough
without this additional obstacle.
They of course point to an easy solution - stop publishing the schematics.
“Who steals my purse, steals trash, but he that filches from me my good
name robs me of that which not enriches him and makes me poor indeed.”
- Shakespeare