-higher ranks avoiding games with lower ranks
-higher ranking player losing a game suicides against the lower ranking contender to mitigate point loss
-high ranking players leaning harder on lower ranking players (similar to above)
-low ranking players ganging up on high ranking players to sweeten the pot
solution: make a fixed point value for each rank or percentage of score that doesn't factor in the winner's rank.
discuss. and list more questionable incentives, i'm sure they exist.