The story starts with the goblins themselves guarding a magic +1 sword, the hax shield of wonder and a bunch of other magic stuff including a cup of endless napalm. And only lv.1 adventurers bother going there.
Random rookie guard in the brassmoon barracks is packing another +1 sword. How can a rookie afford one of those if they're supposed to be super rare?
Captain goblinslayer has a collar of no-save domination and uses it only to keep a sex slave.
And when Kin escapes, she instantly finds a magic crossbow just laying around.
The maze of many is literally "go in and then go out packing at least 1 mid-grade magic item, probably more, everybody's a winner!". The local economy should have plenty of magic bling flowing around from that alone.
The axe of prissan has swapped hands countless times but somehow nobody pays much attention to the giant golden glowing axe. That strongly suggests that giant glowing golden axes are just that common that the axe of prissan is a tree hiding in the forest.
Kore himself didn't find it strange at all that the filthy gobs he's been hunting are packing no less than 3 magic weapons between them (at least until getting in touch with the paladin axe).
And Kore was just fine looting the racist axe from a clearly super evil dwarf.
Although in the other hand Kore did not loot Chief's hax splitting spear.
Every proper goblinslayer knows that the best way to hunt gobs is to use their own weapons against them.