What I want to say is that it's greed that made the predictor of the game to lose his chance of winning 15 million naira instead of winning along side his friend. So have you given anyone a booking code and he won then you lose?
Aside from greed, I think his over confidence makes his bet lose since a greedy person alone will not share his bet but rather just bet it for himself. He shares it because he is confident on his pick while he add a few games more due to greediness and confidence that he will still win despite the added match games on his slip.
This happened a lot not only on gambling but also in trading which the signal provider usually overextending calls the result to lose. The guy who won the bet by copying the pick of his friend is surely has a lot of trust on the friend for just copying the bets completely doing any changes based on his own analysis.
I think a couple of beer treat will help to ease the pain for the loser friend.
