Yes, playing for pride is a myth. These players do this for a living. Winners and losers were paid the same, so this was a friendly game of pool, a paid exhibition with no money on the line.
It was not the best of Europe vs the best of Asia. There are a couple of European players called Fedor and Josh that happen to be the two best players in the world who were not members of Team Europe. Then again, Naoyuki Oi, Ko Ping Chung and Anton Raga could spot some members of Team Asia, so it wasn't really the best of Asia either.
Professionals in any sport play first and foremost to earn a living. That is undoubtedly true. No pro plays solely or mainly for pride.
That's not to say pride is never a factor imo. Often it is. The most obvious example is pro players, such as those in the NBA, that play in the Olympics. They don't get paid. They are playing to represent their country.
Does it help with endorsements? Sure. So some money might be involved.
Soccer players in the World Cup are another obvious example of players playing partly for pride.
Having watched the entire Reyes Cup, it was obvious that pride played a role, most notably with the Filipino players, Chua and Biado. But I also got the sense that Ko, Yapp and Duong fell some "pride" too.
To them, at least, it was more than just a friendly game of pro even though the winnings were the same for everyone. Chua and Yapp specifically said so.
It was harder to get a read on what the European players thought.
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Was the match the best of Europe and Asia? No, but it was lot closer to being so, imo, than you seem think.
I'd leave Fedor out of the equation since he is living in the U.S. He and his future wife, Kristina Tkach, told a local Indiana TV station recently they are working on getting U.S. citizenship.
Filler was obviously a big absence, as you note. He is the best player in Europe.
Aside from him the only other player who could make a clear case for being the No. 2 or No. 3 player on Team Europe is Albin Ouschan. So it was not a weak European team by any stretch.
The Asian Team, on the other hand, was darn near the best of Asia. Switch in Ko Pin Chung for Duong and it would have been.
You mention Raga and Oi.
Raga hasn't done much since getting to the finals in the European Open in 2023. Jefrey Roda and Jeffrey Ignacio have been more impressive, but none of those three Filipinos are better than Ko, Chua and Biado. Nor do they have Yapp's track record.
Oi is ahead of Duong in the rankings, but unlike Duong, he's never won a Matchroom ranking event. Nor would I put him above an in-form Yapp.