Many of the 'competitions' are hardly such, but carnival games or games of chance... a ring toss, a shuffleboard puck, a big club and a whiffle ball, etc.
It's a stretch to say that someone is likely or not likely to win something without even knowing which pseudo-contest is coming up.
Even the 'quiz' ones aren't always based on knowledge but on some other random factor like what fans voted and thus they are more or less a dice roll, not brain power.
If I told you the next competition was about physical endurance and core strength, would you say Kalia would be top 2? Of course not, and yet she was.
A lot can still change with the dynamics so giving up a week of assured power, influence and control for the low probability you might win the following week is bad game theory.