I can see the Unid’s rise in price as people are tempted to gamble. Look at those really high priced dyes that many players would like to have. Those who feel lucky will buy a small potion of Unid’s in hope to get e.g. Abyss, rather than paying the whole sum at the TP. Just like precursors. Therefore, a demand will always exist apart from Bifrost.
Also many players open their Unid’s which make the supplies dramaticaly lower than expected.
I would assume the price would rise in a few months to be a good profitable investment.