The gold economy is fucked in most D&D games. When you actually do the math like one dungeon crawl nets your party enough cash to all retire to the fantasy version of Hawaii. I mean it kind of makes sense when you consider it's meant to be a world of magical wonders but where most people are still living in a feudal peasant economy, but most D&D groups like to RP as "ragtag adventures" which doesn't make sense when they're walking around with $500,000 in loose cash on them.