RE: SPORTS TODAY 27th August - 1 HIVE + 200 SPORTS givewaway

Wow, big surprise when I read the news earlier today. Everybody thought it was almost done with City, and then out of nowhere (at least for me), the announcement Ronaldo is going back to Manchester United! Twelve years after leaving the Red Devils, he's back!
Surprisingly, the transfer amount seems to be 'only' 15 millions euros (and possible 8 millions add-ons), that seems very low in the current market. What am I missing here?