I don't know if its always a matter of skimping on oil Cam, but some people (me included) genuinely don't understand or can tell the difference between oils.
I don't understand the difference between a $50 group IV oil and a $200 group IV oil. They're both the same grade, so they should be the same quality, it's just price that is difference (those prices are just an example...).
Not sure if I'd ever run my car for 10,000 ks between changes though. I'd rather put a decent oil and filter in every 5,000ks, even if it costs ~$130 a shot. Simple insurance! Always changed my cars at 5,000ks, turbo or not.