Always have mixed feelings about Demonstrators. A large part of what we pay for in a "nice" pen is the resin or cellulose body. When we buy the same pen in clear plastic, for the same (or higher) price, we've left a lot on the sellers table. Clear plastic pens should cost less, not the same, and definitely not more.
TWISB is the exception, obviously!
For reference, while the Pilot CH 92 is $220 from licensed US retailers, you can get it for half that from a Japanese importer. eg: https://www.amazon.com/dp/B0046L6L4S
If MassDrop could get it for less than that, I'd definitely jump on it.
It can be had for a little over $100, sometimes even a bit under, on eBay.
It definitely is fantastic value at that price.
The price of TWSBI 580 plus $50 and you get a Japanese piston filler demonstrator with a gold nib.
I have the TWSBI 580 AL, a great pen, but I regret getting it rather than the 92. Now I have to own both.