Grad school is rough. However.. it is also rewarding. There is something to be said for getting to spend the majority of your time on your passion. If you're going into it with the sole purpose of PhD = high paying job, then grad school isn't for you. School is not an automatic in to anything - its the opportunities it provides - good research, networking/conferences, solidifying your goals, etc.
I would definitely echo the recommendations that you go into the industry first. Real world experience can't be beat, and it helps you figure out if what you thought you wanted to do is actually what you want to do.