But if a player has a substantial advantages in chips, he/she would not do it.

It is easier to cut when 3 playes left at their level. There are many past world series stories about the proposals and deals, especially among players with good relationships, like Annie Duke, her big brother, Phil Hellmuth...

Some players even play as a 2-3 member team, each gets a share of other's winning.

Bottomline, they are high risk professionals, money is more important than fame if they already have fame. :）