Its not enough to work 14 hours a day, you need to spend more time ''selling yourself'' otherwise there is no chance of promotion. All managers need to say a ''yes'' else no promotion, which is tough if you come in, do your work efficiently at your desk and have a life after work. Also there is wide variation in salary ranges - analysts doing the same work as their colleagues sometimes earn twice as much just because they are from a better college (and more often than not, the underpaid analyst is the better performer). Hiring processes are also unplanned - claims of taking in only 1% of workforce and going to good colleges only is all fine on paper, but when new projects come in, hiring from tier-3 and tier-4 colleges happens which leads to both differences in salaries as well as in abilities to do the job at hand.
When I quit my job, the number of clients who reached out asking why I am leaving was three times the number of people in senior management at Fractal who asked me why I was leaving. Says volumes about getting (or not getting) appreciated at work.