What are you suggesting? - so as class d you get to sell ores for in game money to craft npc so why not make it so that you can also trade ores with fellow players!
How would this change better the server? - it would be great for helping new players out and doing more teamwork.
Are there any disadvantages of making this change to the server? If so, explain. - players might get into trading instead mining.
Who would this change mostly benefit? - class d because then they can craft more things! and they might do more teamwork than solo.