I bet it costs millions to come up with that bullshit of shyvana nerfs (the "rework", not the 20% nerf) or to gather for like 20 minutes in an office and throw darts at a whiteboard and then write down some nubers.
I'll give you a few examples of where all those money go
-Krepo's gym costs
-Yacht fuel
-Nu-Males employed at riot that basically smile, shake hands, shitpost on twitter and eat donuts all day
-Overpriced stuff
And after all that they still have to spare to
-Pay wages to the employees
-Infrastructure maintainance
-Logistics
-Advertisement
-Content creation
-And all the legit stuff one may expect from a corporation
If you think that they put 100% of their income in developing the game you're really naive and/or don't know how money moves in this world.
Oh also the content of a wallet of a single day of a wall street employee could end homelessness in a big city in the united states.
And there are hundreds of "celebrities", "politicians" and "public figures" that waste ridiculous amounts of money every single day.
fyi