Nope, never got a PhD, but thought about it. The discipline to obtain that level of knowledge would have been an enjoyable pursuit, and, not to mention, the life of a college prof is a pretty good gig. Alas, I settled for a master's degree in my chosen field.
And, coincidentally, I have continued to learn my entire life, seeking out experts to teach and mentor me. Last night was my first night in SCUBA lessons. Love the learning process, from flying lessons, to kayaking, to SCUBA, and I think the learning curves are similar and challenging / rewarding.
Oh, and if you really care about who paid for my college, it was me. Of course, those were simpler times when tuition was significantly less than it is today. A guy could work part time, drink lots of beer, eat pizza, and chase co-eds while still making tuition payments off a part time hourly wage. He'll, even have enough money to rent a c-150 for $25 an hour, pay an instructor $12 an hour.
I don't think kids can do that now days.