You know what dwarves love?
Gold.
Its a known fact that even in the old times, before the Tolkiening, dwarves were fae spirits who loved the gifts of the earth and the work of their own hands. Ifn yer complaining about being able to show it off, then clearly ye dunnae know anything bout how beautiful coins can be, nor the craftsmanship that can go into making even one.
Have you ever seen a lovingly crafted coin made out of obsidian fer example? Runescape might have crudely carved Tokkul, but some collectors would spend dearly for a beautiful piece of art etched carefully in the brittle rock. Ever seen ruby coins? Diamond coins? Coins made of crystal that shine like a glass prism in the light? Such things go beyond the mere value of the material used to make it, and take a value of their own just from the sheer artistry that went into it.
And not all treasures need be made of gold neither: Theres chalices, tapestries, ornamental weapons, and even furniture that could take a lifetime of diligent work by a perfectionist that ends up in a barrow just because its so beautiful that the owner wants to take it with them to Valhalla rathern give it up to Hela. Statues done in rare metals and set with gems, made to look like angels by the way the sunshine catches their wings just so, made from the purest metals slaved over lovingly by a smiths hands. Things prized by thieves and collectors the world over. Doors built to not only open halls, but to open minds to the histories of the worlds that came before us.
And yer tellin me, you dont want none o' it?
Well, thats your own shame then. Ye can sit in yer roughshod chair, made in a night out o' sticks and determination, and warm yer hands o'er a simple fire. As fer us, means more gold an treasure fer us. And Haldor over there. Now theres a dwarf who can appreciate the kenning of a fine piece of work.