In my experience this turns out be a huge scam. Worse a legally sanctioned scam.

Say she had 11 members in her team. She will give $90 to her pet, and $1 each to the remaining 10. That is how this works on the longer run. The definition of a 'high performer' is often hazy here, and a case can be built up to justify giving the money to whom she wants.

Eventually it turns out there are enormous cartel like structures, you have to be in them to get paid up well. Or you slog like a donkey and quit eventually.