bcoz the limited no. of seats in IITs limits the no. of students who can get better education.
i m a student of final year in MNNIT allahabad .
and i have realised a need of this.
students who come in NITs are really not inferior to those who go in IITs ,but at the time of entrance exam ,it is also a matter of luck.
and those who go in IITs , mostly are those having a gap of at least 2 years after 12th.but those who come in NITs ,generally with no gap or at the most one year.
i tell u one story.
i and my friend prepaired for engg. entarnce exam.
for the first year of preparation i got rank 153and he got 723.
i came here in MOTI LAL NEHRU NATIONAL INST.OF TECH.
But he prepaired for one more year and got admission in IIT roorkee.so wt is better.i doint say that i m .but it is wt happens in most of the cases