Piracy before the game's release is
Sales might not be quite as good as reviews would dictate due to the very minimal marketing budget you guys have. Good marketing can make a huge difference to a game's sales figures. It's the draw back to being indie, but at the same time you guys have all the freedom in the world so I think it's worth it for you! However straight up horror adventure games may, in fact, be a slight niche market. Don't let any of this discourage you guys though. Keep making the games you would want to play!
I think with the various distribution outlets and the sales they offer from time to time, you guys will be much more comfortable financially in making your next game. Various sales (especially 50% or more) will push through many more copies. Many people have inherently started to wait on buying games due to the many sales offered across all the different DD outlets and e-tailers.
Thanks again for releasing an absolutely great game and keep us informed on the happenings of Frictional!