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If you want money, PhD is not your best shot. Get a master and get out of school to work. By the time another guy gets his PhD, you should have the quality to be a leader. Your salary should be at least as high as a newly graduated PhD (and you can also save at least $100k x 4 (years) while he has NONE, PhD student income is fucking shit).
If you think that getting a PhD is a worthwhile investment of your time in term of money, you were tricked by /sci/.
If you genuinely want to pursuit a PhD out of personal interest, go for it. Otherwise, get out of academia.