5) It's almost free.

The best students at most major graduate programs are typically hired as research assistants (RA) or teaching assistants (TA). RA and TA appointments typically pay stipends of about $18K per year plus free tuition for working twenty hours per week. Although you will not get rich during grad school, most grad students in engineering do not pay for their graduate studies.

4) You are already good at it.

Face it. You must be good at school or you would not even be reading this. If you are already good at something, why not get better and have fun doing it at the same time? Grad school is a chance to hone your already sharp engineering skills while learning to solve new cutting edge technical problems.

3) You just might learn something new.

When you were a sophomore you probably learned about shear stress for torsion of circular shafts. Did you ever wonder about torsion of non-circular sections for square or hexagonal shafts? Did you ever wonder about behavior of non-ideal gases in hypersonic flow? How about vibration of automobiles and helicopters versus those little springs, masses and dampers? What about combustion in IC engines, or turbines, or rockets, where you need to combine thermodynamics, fluid mechanics and heat transfer? Grad classes are where you learn the intriguing details that were glossed over in your undergrad classes.

2) You finally get to take the classes you always wanted.

1) Research