I have played the EU4 mod, I'm not super deep into the lore but from what I remember Damestear was pretty rare and valuable, mainly found in random comets.

Here it seems to be very abundant and also not worth a lot. There is one law variant that lets you change from artificery banned to nation of magic to nation of artifice. the main benifit of going from nation of magic to nation of artifice is that you can syntheticaly create damestear in reagent labs but like I said Damestear is already so abundantly available in mines or digsites that you never need it. It also isn't consumed a lot the main consumers are artifice factories and to a smaller part mage towers. So my mines are never really at capcity.

If anything reagent goods seem to be the damestear in vic3. it is used in everything and makes everything way better. And before you get those reagent labs you are trying to scour your suroundings for convenient ressources to get more reagents naturally.

I'm not sure if its because I am not relying so much on automatons but so far the demand for damestear seems to be pretty low and the source very abundant at the same time.