I used to work for an auto company. We had a chemical engineer who worked in the lubrication area. I spoke with him about synthetic vs. conventional oils. He said the HUGE difference between synthetic oils, and standard oils is all the imperfections and additives in the oil you DON'T want. These cause early crosslinking and breakdown of the oils properties. He said brand new, the difference between the oils would be nearly immeasurable. But, after a little time at temperature the conventional oil will break down at an accelerating rate compared to the synthetic because of the contamination that was always in the oil to begin with. After maybe a thousand miles, the difference between conventional and synthetic oils becomes very measureable. Near the end of life, the conventional oil would not pass any of the tests he ran, while the synthetic would be holding up quite well.
The bottom line, if you change your oil every 1000 miles it will make much less difference than if you change your oil every 5000 miles. So you can change the oil more often and spend more with conventional oil or you can just live with the added engine wear. Or you can use synthetic and back off on your oil changes and actually save money.
I do agree that most people will have other engine problems....or other system problems, that will cause them to get rid of their car long before the main bearings or rings wear out.
One other suggestion. Spend money to buy a decent oil filter like a Wix or MobilOne. Stay away from Fram filters, they are the bottom of the barrel junk. There are plenty of stories of the cheap glued ends failing on Fram filters and destroying engines.