RoS sold pretty well. (2.7m in first week: https://web.archive.org/web/20140530093934/http://www.euroga...)
But since RoS is an expansion, rather than a sequel, it's fair to ask whether that's apples to oranges. I don't actually know.
But since RoS is an expansion, rather than a sequel, it's fair to ask whether that's apples to oranges. I don't actually know.