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Re:Orris: The world’s rarest perfume ingredient by majos on Tuesday October 09, 2018 @09:31AM (#18175778)
A possible explanation, also from the ambergris Wikipedia page:

> Ambergris used to be very highly valued by perfumers as a fixative that allowed the scent to last much longer, but it has been replaced by synthetic ambroxan.

But buyers still exist for the natural stuff.

> A 1.1-kilogram (2.4 lb) lump of ambergris, found on a beach at Anglesey, Wales, was sold to a French buyer for £11,000 at an auction in Macclesfield, England, on 25 September 2015.

Re:Orris: The world’s rarest perfume ingredient by overcast on Tuesday October 09, 2018 @09:54AM (#18175968)
Saffron is more expensive per pound, and is cultivated. So it's not TOO crazy. Depends I guess on how much is required. (still crazy though)
Re:Orris: The world’s rarest perfume ingredient by mkstowegnv on Tuesday October 09, 2018 @10:34AM (#18176277)
to summarize in consistent units:

Orris oil 50,000 euros per kg OP BBC story

Ambergris 1,140 euros per kg Wikipedia

Saffron 958-9,583 euros per kg Wikipedia