Question 1
Since Dynamis was introduced, the Goblin NPCs in Davoi, Beadeaux, and Castle Oztroja that convert Dynamis currency into their larger and smaller denominations also offer the player the option to trade multiple "100 coins" for synthesis items used in the various relic weapon quests.
This particular feature seems to have been forgotten entirely by the developers, and since its introduction has always assigned a disproportionate value of coins vs. reward. Take for example the average Dynamis run (which used to cost 1000000 gil) and the average coin turnout for a decently completed area (200 without any lucky "100 coin" drop) which places the developers' expected value of 5000 gil per coin (a neutral number disregarding the playerbase demand on specific currencies). Now take an example such as the griffon hide, which is already an exceptionally common drop from Orc Vanguards in Dynamis - San d'Oria. The goblin asks for 8 Montiont Silverpieces for 1 of these hides. That places the in-game value of one hide at 4000000 gil. Since a majority of these offered items are only used for relic upgrades (and the second stage upgrade at that, where only 300-500 coins are requested compared to the 500+ coin cost of the materials needed to trade in for the quest), that would also imply the developers were giving the option of adding to the already large amount of required coins to pay for the upgrade process.
There are far more outrageous conversions of currency vs. materials, such as 2500 coins for a Behemoth Horn, which is an extremely common drop off of ISNM now. Take also into account that frequency of the drops from Dynamis itself such as griffon hides and goblin grease outweigh the demand of the number of relic weapons both the players and developers are obtaining, this feature seems to be very outdated. What was the developer's intent with the goblin offering these trades, and have they considered adjusting the items offered for trade and costs required to make ancient currency more viable outside of relic weapons alone?