You get a Ph.D. for the sheer science of it, right? Well, it doesn't hurt to make money too. According to phddegree.org which went through several studies to find the answer, Pharmacologists are doing fine.
http://www.phddegree.org/profitable-phds-which-doctorates-pay-the-most-25-studies-and-stat-sources.html
A Ph.D. opens up academic doors, helps you get a job faster and sets you in an elite group in the profession. It does pay off financially too though which is nice to know. Check out the site, it's an interesting view on Ph.D. and estimated professor salaries.
