Because hiring is hard (and a time suck) and a degree from a good college happens to be a pretty good filter for whatever attribute makes a decent employee?
e.g. hey boss, they are all MIT graduates
{ the first 10-digit prime in consecutive digits of e }.com
Someday I hope to use something like that for my startup.
In[20]:= Select[Map[FromDigits, Partition[RealDigits[N[E, 500], 10][[1]], 10, 1]], PrimeQ][[1]]
Out[20]= 7427466391