As I see it, it’s a balance between swords and ranged classes.
Clerics are a mixed bag, but mostly in group play they aren’t targeted.
Melee clerics have less consumables used overall plus ways to avoid damage.
See, swords have to go in melee range and this means without a doubt being hit.
This means durability loss. Repair bills.
The cost of arrows would make archers have a fee too. They however, still get hit.
The consumables for mage spells have always been there, just not used.
After nearly 2 years of having no real costs for spells, now it bothers you?
Silver sinks are vital to keeping the player economy balanced.
If a wizard has no costs at all, it’s instantly a better farmer.

