I would do a PhD if they paid me enough. I don't mind if I cannot find a job that pays well with a PhD (I actually don't need a PhD for that); I would do the PhD because I like doing research. What would bother me is to spent ~4-5 years without a decent income. The scholarships here in western europe are just too low, and I cannot justify not working for private companies in favor or pursuing a PhD during ~4-5 years
Then at graduation I was offered a well paid job in the industry. Decided to pursue it as opposed to spending 5-6 more years in academia looking for grants.
Would love to go back and get a PhD, but the economics just don't make sense for me. For now, it's a retirement plan.