1. IITs and IIMs are the premier colleges of India; actually the best. And those who are studying there or have studied, got there after fighting cut-throat competition and working their asses off.
2. Their alumni are already at a higher position at the best of the firm, thus they are well connected in their industries.
3. They have gone through grilling sessions, training and classes to reach where they are today.
4. They have had wide exposure through internships, workshops, marketing fests thus they develop a unique skill set.