If you were unfortunate to not get selected to represent your country in the team event, then you have the potential to final table 4 of the 6 events available. (5 if you choose not to play the main event)
The reality of this is that the winner of this award will collect points in two events, maybe three, so there is no real need to put a cap on the number of events they can collect points.
If a player managed to collect points in four or five events, then in my opinion, doesn"t that mean they deserve to be awarded "Player of the Championships" ?
Yes, it does benefit those players that are playing more events than others, but as Tighty has mentioned, if it was just awarded to the winner of the main event, it would surely be a bit pointless. Of course, if the winner of the main event, also final tables a side event or two, then they deserve the award.