SighSadly there are far too many people with the "It doesn't bother me" attitude, not necessarily on the Shack but other forums. While it would suck if there were ads from the start, at least then you'd know what you're getting into. But patching it into the game after people have already bought it with no benefit to them is just slimy.
It doesn't seem to get people annoyed enough. It happened before with at least one other game I know of (Counter Strike 1.6). Either have the ads from the start so people can decide if its something they want to deal with, or raise the price of the game so you don't have to put ads in in the first place.
