I've known a fair few popular kids who were popular because they were socially-oriented and warm, but there's always a side that's intolerably vapid and status-mongering. Why the decent ones were ever seen with them I'll never know.
This was my experience, too. I mostly hung out with the outsider-type people, which worked for us because we understood each other and were happy to have people who cared. Well, most of us, anyway.
In my sophomore year of high school a new kid transferred in, and my friends and I wound up inviting him to our table because we noticed he always sat alone. Chubby, awkward kid who had an intense emotional breakdown prior to the transfer, but we loved him. He wound up ditching us for the worst of the worst when it came to the "popular crowd" after he remodeled himself next year, and didn't have time for us except to show off his new popularity and pictures of his hot new girlfriend to me (knowing I'd liked him). Because, you know, cool people who wouldn't even look at him when he arrived let alone support him through the echoes of his suicide attempt are a much better social ideal to strive for than uncool people who would.
I got a call from him a few years later, but it turned out it was because the chick had dumped him. Heaven help him if he ever needs what he had with us in life again.