Have to think of overhead first and foremost, then you can think about actual profit from there. We don’t know how many employees are specifically working on D4 alone. So a good portion of those sales would obviously go toward keeping themselves afloat. We can’t go off of the credits because those are highly inaccurate, boasting over 9K people who actively worked on D4 up to its launch, obviously most of which don’t stick around after their job is done.
If I had to make an educated guess I would say anywhere between 500-800 actively work on the game, maybe even less then that at this point. I’m not including the teams that work on all projects of blizzard mind you either, which would include marketing, CM’s, QA (to an extent), Support and operations (IT, Live Ops, infrastructure), Legal and Compliance, Localization and translation, etc. Mostly talking about the game designers, artists, programmers, audio team, QA, production team, writing team, etc.
So after all of those salaries are paid, then it funnels into the revenue pool for the company which goes toward everything else, including but not limited to continued support, operating costs unrelated to staff, such as office space/equipment, investing in new technology, marketing and branding, hiring, stakeholder dividends and incentives, the list goes on.