8 million sold $1 apps, less 30% to app stores, that's $5.6m. If all 17 people on the about page took $100k salaries for the full two years (which they probably haven't, they've likely grown to this size from a lower number over the two years), that leaves $2.2m for running costs and profit. Besides that, they have 7 other apps in their portfolio which must be expected to provide some revenue.
In other words, what would they possibly do with more cash?