I think many people, such as myself, tend to truly believe and stick with what has worked over the course of their mechanical/driving time.
My parents - for whatever reason - chose to use Havoline as the staple when they started driving, back when. Even before my Dad started working at his Dad's dealership.
My Dad liked to "play" with engines, some needing rebuilt (old when purchased), some he just liked to tinker with - 2 in particular, a '69 Mustang, and a '72 Challenger. In the late 80's, after some odd thousands of miles on both cars, running Havoline, some "tinkering" began to take place. Now these were the 1st two cars they'd owned since basically brand-new, so they'd had a diet of nothing but Havoline.
They were the first of the many engines he'd worked on that looked exceptionally clean, had low wear, and truly didn't "need" worked on. All the other cars that came through his hands - with some 50k or more miles - that needed engine work, their insides looked horrible.
Now who knows what kind/brand of oil had ever been used in many of them. But you tend to stick with what works, for us it's Havoline.
And I look at your comment the same as one saying that a Toyota or a Honda is the end-all best of the best.
You go to a dealership, and they'll rip you off for that stupid "Toyota" name, or for instance, because I own one and have experienced it - take an Isuzu Rodeo for instance. Honda took part in staking a portion of the Isuzu Rodeo's and rebadged them to be a Honda Passport simply because they didn't have their own SUV up and coming - at the time.
That Honda Passport is 100% an Isuzu, it's NOT a Honda, period. However, if you look on KBB, that Honda Passport, same year, same mileage, is worth more then an Isuzu Rodeo - but it IS an Isuzu.
Now I'm not knocking Toyota, we have one that's 20+yrs old, I, like you and the Havoline, am just sick of them being broadcasted as the end all of the best when they have their faults.
Yes, in the future, I will be getting a Toyota Tundra - just don't care for the $$$ of them.