Soo it's nowhere near the same- but in FFXIV I once spent weeks after an expansion crafting/gathering to make money to buy a large housing plot. By the end of it I had around ~600million (an absurd amount). Unfortunately my luck just wasn't here and I lost every lottery I entered. Now- I probably have like 5 million. Where did it all go? To other players. I'd just buy people things. Someone in chat said they really wanted this or that- I'd buy it. People wanted a small/medium plot and didn't have the money? I'd give them the gil. I found literally no reason to have so much gil just for the sake of having it, and I love seeing people get excited. I'd put together little welcome packages with expensive mounts, minions, clothes, etc and gift them to new players. I kind of started doing this in real life to, just to a lesser degree as a stranger handing you a gift can be a bit weird. I'd like to imagine, with infinite wealth, I'd do the same thing to a larger scale- really find ways to improve and bring joy to the lives of others. I'd obviously spoil myself with things, but I imagine I'd spend most of it on other people.