how much money does Pokemon Go make daily?

They are likely making a large sum of money in the tens of millions by now I would speculate.
People spend a lot of money on micro-transaction games in some cases, so I wouldn't be surprised.
No official statistics, but this is a solid estimate.
 
http://venturebeat.com/2016/07/29/app-annie-pokemon-go-makes-10-million-every-day-without-cannibalizing-other-games/

take a look
 
Solution
Funny to think all that money comes from such a small number of players. I heard it's something like only 2% of all mobile gamers who actually spend money on in-game purchases.