Still not sure exactly what luck does, but it sounds like almost nothing.
I recommend devs either remove it entirely or change it so luck actually does:
1.Increase chance of drops
2. Increase gs of drops
3. Increase rarity of drops.
Otherwise there is no reason to wear luck (I no longer wear it)
They said it raises the floor for rolls and gives you better chance at dropping named items. I do believe pearls are broken though bc with full pearls I get garbage drops.