That's also true. It's usually 10BTB=1 coin for codes, as in 400 for a 40 game code or 1600-2000 for a console code (160 coins).
Games seem to go for a bit less. I think the codes themselves are in higher demand (thus higher price) because more people are after them for physical rewards, or to get to gold or platinum status.
@jobby47; I understand you're trying to figure out the ratio to sell your game at, it varies from game to game but personally I don't think you'll get 10BTB per coin in that case simply because it's not a popular game like some others. Obviously you can sell it at whatever price you like, but I'm just letting you know that it might take a while compared to a Mario game, for example. But good luck! c: