Well, for the record, I "only" spent $20,700 (cash) out-the-door for my 2011 V6 Equinox 1LT, but even if I HAD spent $30,000 or more, that doesn't mean that I would then feel compelled to purchase the most expensive oil changes I could find.
If someone wants to try to convince me that I should be putting Mobil1 in my Equinox, I'm all ears. Let's hear it. And don't tell me I'm going to get better gas mileage because I saw one bottle of 0W-30 (I think it was) that claimed a 2% increase in mileage and that's only a 1/2 mile per gallon increase on a 25 mpg vehicle. Not even noticeable, and certainly could not be attributed to the oil given that different people might be driving the vehicle (and under constantly changing conditions).
Sythetic oil reduces the number of oil changes you need to do. That's about it as far as I can see. I'll be using some brand of sythetic because it's (dubiously) required by the manufacturer. But I'm probably going with the least expensive stuff because I've got 600,000 miles on three cars that says there's no need to do anything more than that...