Owning a practice also results in a tangible asset. I am happy renting until I can buy a house outright (it's the new American Dream!), and I don't need fancy cars as I often bike or bus to work / school and own a twelve year old Toyota Camry with 200,000 miles which runs beautifully - go Toyota! You can't walk away from student loans, you're right. You had better be damn sure that dentistry is what you want to do when you make the decision to attend d-school. But, there are risks involved in everything you do and don't do. Not going to d-school is a risk as well. You may wind up working a 9-5 under a boss you hate pulling down $50,000 per year and wishing you had gone to dental school. Life is full of risks, and I've learned from nearly a decade of working crummy jobs that some risks are definitely worth taking.
Wealthy is in the eye of the beholder (hence my quotes earlier). I worked in the real world after college earning ~$40,000 per year before taxes with crummy benefits. When I see people on here complaining that they will only be taking away a gross income of $70,000 after their loan payments, that doesn't bother me because I have lived pretty well on much less. With my income I rented a decent apartment, owned a car, traveled to South America every other year, took ski trips, went camping and backpacking, went to the symphony and ate out once a week with my wife. Life was pretty good, and we were good at finding great deals and living frugally which is a skill I encourage everyone here to learn.
One of my coworkers had put in 43 years at my facility when he retired. He was earning $21 per hour and making roughly $57,000 per year at the end (lots of O/T). He was proud as hell of his time there and he retired on $1 million in total assets. His wife worked on and off throughout their 40 year marriage, but never more than part-time and she was usually minimum wage. If he was able to save $1 million, own a home, have two newer cars, raise a family with four children, and buy the RV of his dreams after retiring, then I don't know what is wrong with the people on here earning four, five, even six times his income. As someone said in another thread, you have to let your money work for you (Roth IRA / 401k, stocks/bonds, etc.) He lived frugally during his younger years. We will all have to as well if we want to be wealthy at the end of this. But I don't have much sympathy for people earning $200,000 when I was living on 1/5th that income and still managed to put away a large sum of cash to go back to college.