Let's say their employees are paid $100k each per year (average). And let's say they cost $50k work workplace/perks/... each.

Then let's say they lose 10%-15% of revenue in licencing cost (apple, ms, google, xbox, and let's say some facebook/twitter campaigns and software).

So then you'd have $322m * 0.85 - 40 * $150k - 128m (notch's pay) = 139m profit.

That looks reasonably close on the money. So you'd expect net income to be about $265 million.