It will make them look good in front of prospective employers 1) they will have better ranks as they came through merit and perhaps brighter 2) the person coming through reservations will be seen to be inferior and hence not good enough.
So the merit guys get the 3 lakhs a month a job. The reservation guy gets the 3 lakhs a YEAR kind of job. Check with IITs and IIMs - that is the story in the campus anyway.