I'm paying for my dental education, and my trip is to study. I am paying a little bit to be there, but the majority is on scholarship.
edit: I'm also 25 and have been working "in the real world" for a couple years 😛 Armorshell makes a compelling point, but assuming we're all going to live relatively comfortable lives as dentists, what's the difference if we lose out on 300k over 30 years? I'd rather pay that difference than to think about what if's (would I have gotten better board scores, would I have enjoyed my time at Colorado more, would I be more proud of my degree), but that's my personal feeling. I don't plan to live a very extravagant lifestyle, so the difference between netting 70k a year vs 80k is not huge to me.
Also, someone who is planning to live an extravagant lifestyle is also probably aiming to make much more than the average general dentist, and so the difference would be even less significant 😛