Why we need enough material sinks to keep world alive and fun

Yeah, and?

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As long as pve is difficult, people will die when fighting and their gear will decay even faster than in pvp. Caravans sink a part of resources too, and considering that they'll potentially have x100 of a player's inventory, that's gonna be a big chunk of resources just gone from the game.

Also, the only source for gold is mob certificates. And the game will have a world manager that will control how much money you get from said certificates, and on top of that you'll have the fauna control system, where if you overfarm some valuable mob he might start spawning less often for a period of time which means that the overall value of the location will drop.