An idea is a server owned shop where you would buy items as well as sell items, this makes hard to get items, diamonds, emeralds, etc. a little easier to obtain, the prices probably wouldn't be low, but it would assist people making big builds or people trying to finish that quest they have been doing for a few days, I hope you take my idea into consideration. Thanks!
There's this thing called "voting" It basically gives you 16 diamonds whenever you do it (At least on Ederien) So if you vote for the server, I think you may find those hard to get items a little easier to get!
Also, most quests involve killing off mobs, not obtaining items.
But I do understand your point about big builds, I like this idea, but I don't think it's first priority in the grand scheme of ideas, because as of now, it would really only serve one purpose.