Jesus, that's needlessly hostile. I don't know why currency denominations is such a thing to get enraged over, but the D&D currency system isn't exactly something terribly exotic. Heck, it's less complicated than the US dollar. It's not like people are asking for Moons or Steelpence or Brass toals. Copper/Silver/Gold/Platinum is a simple as having 1, 10, 100 and 1000 dollar bills, and currently the game has us paying for everything in the equivalent of hundred dollar bills....which is a bit weird because BG IIII has a lot of 'vendor trash'-forks and empty bottles and apples etc that are obviously worth far less than 1gp. Copper pieces is just a more sensible baseline for the sort of economy Larian has set for the game.
Plenty of other games have multiple denominations-and it doesn't hurt the gameplay experience one iota. What it *does* help, is giving it that verisimilitude that's nice to have in video games.
Off the top of my head Dragon age, World of Warcraft, Drakensang all use different denominations, to no detriment to the player. Most games convert from one denomination to the other automatically as well, so there's no record keeping by the player.
Now if it's as easy as you think for Larian to just switch over that it'd be easy to mod, than by no means is it anything that's going to throw the game into 'development hell'. It would only improve the game by enabling a more sensible price range that allows for more nuanced pricing of goods and services. This is an area where the game could be improved and I for one would love to see Larian give it a go over. They probably should give currency a go-over at some point anyway because of some of the wonkiness with trading and currency being stored on different characters etc etc.
