Game developers are reluctant to share sales data, usually because of contractual agreements and other legalities. So, when we do get numbers, you can't help be fascinated. In the case of Monument Valley, creator ustwogames has happily put its success into image form, providing some insight into what it takes to produce -- and fund -- a hit iOS game.
You can view the full breakdown on the Monument Valley dev blog, but here are the interesting bits.
iOS is by far and away the top platform. Despite the plethora of Android-powered devices out there, Apple's platform remains the more profitable target for game developers.
Unsurprisingly, launch day was the best in terms of sales, with Christmas the next big revenue-generating event. Note that the $US2 sale worked out well for the studio and didn't really have a detrimental effect long-term.
Yep, games cost money to make. The thing to remember is that the bulk of this is salaries -- even game developers need to eat and live somewhere.