Absolutely, it will start to add up. But again the issue is with the silly behavior of the end user. Even an efficient card is still wasting power just sitting in a game you are not playing. You are just wasting slightly less power, but still wasting it! If they complain about their power bill after doing that kind of shit then I have no sympathy... Really? Plenty of halogen globes well over 45w at your local Bunnings. $12.50 for a 6 pack of 70w globes, cheap as!! Due to the small upfront cost people still buy them too.