I'm not in a PhD program (yet- hoping for an acceptance ) but I can sympathize with your concern. Were I to enter a PhD program (which I will hands down if I get in), I too would be leaving an extremely well paying job and perfect work environment. So would my husband. He has more to lose ... Seniority, freedom to work on what he wishes usually, working with his family. But for us, it's worth it because a PhD is something that I've wanted for years now and I see it as crucial to my personal and intellectual development, not to mention that my dream job is to be a professor in my field. As Hillary Emick said, "This is about doing what I want to be doing with my life and following my passions..." I'm not worried that I'll mist likely be earning half of what I'm making now. I didn't always have my current job, so the extra money is certainly nice but we are people who have much and want little. We'll be ok. You ultimately have to make the choice that is right for you. As others gave said, you have to be 100% committed to getting a PhD if you choose to enter a program. PhD studies aren't easy and command a large part of your focus. You'll need that dedication, that drive, to keep you going when things get tough. If you aren't totally committed and choose to enter a program, and I don't mean this to sound harsh, but there is someone else who probably could've gotten in who truly was gung ho had you not attended. So that may be something to take into consideration. I wish you a huge congratulations on your interviews! Good luck making this choice