You have to keep in mind that, traditionally, app sales basically halve week on week for the first month or so, and then hit a plateau. You basically make all your money in the first month (or two, if youre really lucky). So, if i was in their shoes i'd rightly be worried: they'll likely make 2000 next week, 1000 the week after, and so on. They'll be lucky to make 10k out of this, which is great but not life-sustaining for a team of two in the first world.
Of course i'm talking trends, not real numbers here, so don't nitpick the specific numbers i've made up here please.