I'm still to get into my bschool. So you may say that I'm in the transition phase from being an aspirant to a student.
My 2 cents on this topic
Firstly, I think one important factor in being in a good bschool is peer learning. You get to interact with some of the sharpest brains in the country. Also, they will be from diverse fields. In an organization like say Infosys, you may come across intelligent people, but at the end of the day, they will be software engineers. In a bschool, you will have doctors, hotel management grads, automobile engineers and more.
About your argument that the value is as much as its entrance test, bschools like IIM-B, SCMHRD, SPJain, MICA gives call at low CAT/XAT/SNAP scores, but they are considered extremely prestigious.