Keep FG going?

[wcer]

Someone slid in a link somewhere that Amnesia almost got canned, and indeed in order to pull it off Frictional had to chop salaries and such.

I think everyone here is obviously hoping Amnesia will be the hit that Penumbra deserved to be, but a question does come to mind;

How many copies does FG need to move to stay in business (and ideally make us more great titles)? I appreciate that this sort of information is not typically made public, but I know there are some (perhaps even plenty) of us who would gladly buy multiple copies, or even flat out donate if that's what it came to to help meet whatever target is needed.