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Personally, I run my cheap dino's out to 9,000 miles now, in our car. I see many, many syn UOA's (in fact more often than not) with fewer, sometimes half, the amount of miles.
But like so many have said, it's your money, make yourself feel good.
Two thoughts -
1) Dino does go on sale more often, and I'm fortunate that the most we put on a car in a year is ~7k and the dino is fine for that mileage. The few dollars I save every time I buy my $2/quart dino (or synthetic) adds up and is what allows me to take my wife to Outback for that good steak. For us, it's all about prioritizing how we want to spend our money.
2) Both of our DDs were purchased with well over 100k on the clock. I very seriously doubt that the POs ran synthetic - one was an older woman that did maintain it, but wasn't a 'car' person. The other used the car for work and didn't even maintain it very well. My expectation is that even on dino I will put well over 200k on these cars before getting rid of them.
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giving yourself a warm fuzzy feeling by overthinking and overbuying motor oil should be a chapter in an abnormal psychology textbook.
Ouch! That's a bit strong. I'm a self-admitted cheapskate, but if someone wants to pay a bit more for a OC and get's a little piece of mind from it, more power to them.