It's a very good leverage and a great credential a master degree is specially if you're aiming for good rank in a company you're applying for. A master's degree is also given to a person who actually 'mastered' a certain program. This gives the company the confidence that the person they will be employing actually knows what he/she is doing.
I dont find having ma masters degree important. I mean, we can all be successful with just a college degree, correct? Having a masters degree is just for self fulfillment for me. If you feel you really need it then go dor it.