I think all of you are wrong. I strongly sympathise with Sterling.
Imagine that you work with a team of colleagues and that you are among the top performers. Yet in the same tam people who perform much less better than you, earn much more...how would you feel?
This is not about money. It's about real appreciation and even about justice. In professional life it isn't enough if your boss says every day how good you are. In professional life appreciation =salary.
For those players, playing football is a profession. Imagine Sterling having a carreer ending injury. Liverpool will organized a testimonia' and will collect money. Five years later Sterling will be forgotten.
He has every right to do this.