Make gold pedestals & glass display cases, put them everywhere and display your valuable items.
Make gold statues all over the place.
Decorate your furniture & finished goods with gems, gold, silver, etc.
Make blocks from valuable materials, then build castles with them.
Or play with rare resource worlds.
Did most of that. Only use gold furniture. I am also making platinum nest boxes. Set gold and platinum statues up. Encrusted a lot of stuff with jewels, untill the jewelers got stressed from overwork
I'll just have them encrust random items when they are ready to take another dig at the gem pile.
In many games wealth is a goal in itself. I like that in DF, dwarves should be about mining for expensive stuff and hoarding it.
But wealth also translates into power, meaning access to actions that you only can do with wealth.
In shooter games it is upgrading your char with the best guns and armor, whatever is in the game. Paying a bazilion for a measly +1 bonus, because why not. In city/strategy games it is usually fast-build big things or bribe enemy units/cities. Also whatever is in the game.
DF does not have anything I am aware of in that department.
Wealth DOES increase your access to actions, in the sense that you can increase the number of caravans and buy them all out.
But you get to that point easily and it maxes out because it makes no sense to buy like 20K units of standard booze every year. It would make sense to spend that money to get 500 units uf super-luxury booze though.
The caravans you get stays the same one as the one you get the first season.
So it feels like you're super rich, but you're on a deserted island so you can do nothing with your money lol. In the entire world, there's not a guy selling something only a rich guy can afford to spash money on. That is also anti-RPish to me. I'd like it to feel like there was a bit of a rich man's world in the game, and then you'd work towards getting access to that.
And to me, that makes the wealth number just a number that means nothing. If I made the fort 10 times richer than what it is now, I would not have anything I don't already have. It's just the number on the screen would change, but the number does nothing. I don't become like renaissance Venice that could pay off everybody and had the most luxurious stuf the world could offer. I just become a guy sitting on more gold that can't be used for anything.
(In the long run, I think you should be able to splash money on consumable items, hiring people (mercenaries, scholars, whatever) and bribing other civs to start/stop wars. And it would just be something to make you think, hey I did good, I'm a big shot now, I mined all this gold and now i bought some Elven Full Moon Booze and 3 scholars to write books, and I paid the humans to attack the goblins, I'll mine more gold now! You could make it literally "infinite" in the sense that it would become impossible to buy more than a tiny fraction of everything buyable in the world. Say if bribing a civ to start a war cost 1 million, it would be hard to get all civs to go to war with each other. Of if the best booze in the world cost 20 K a unit, you'd also be pressed to just be awash in that. Numbers can be tweaked, but it is possible to just make them super high. Instead to me it goes like, IDK I think I have the gold I need, I won't bother mining any more.
So I think it would make the game better and more interesting if you added an inexhaustible "rich man's game" part to it.
It would make it feel like you progressed, and the game went from (beginning) about surviving and having enough beds, to (middle) making rooms for nobles and putting gold fornutere in all rooms, to (end) deciding if you spend your fortune on super booze or super socks, maybe just stash it, or being a war monger or a peace maker - plus an infinite number of combinations of those things.)