Talt drops from dungeons and has a resale price of I think 5k silver to vendor/npcs. So it has become sort of an alternate currency, since itll always be worth 5k unless IMC changes it. Guilds also need it for something but Im not sure.
Dilgele is the odd one. Alchemists use it to make potions. But the pricing on the AH sometimes looks well not I guess normal, cause the stuff drops everywhere so its a bit wierd. Many players have been speculating why. But still alchemists use for potions, which people want.
Rubys as far as I know are just used to craft higher quality things (weapons/gear), so its wanted because of that.
20char means 20 characters, the forum requires every post to be at least 20 characters. So say someone asks, “Is this game going to be f2p eventually”, and I respond in a post with just “yes”, the forum wont let me post just yes. So people will add the /20charactersmeowmeow at the end of post to make sure it meets the minimum character post requirement.