I left my 10 year reunion wondering if I'd return. It seemed that everyone was way way too concerned with each other's success. Where do you live? What do you drive? What do you do? Do you make a lot?
Pfft...
Then, I went to my 20 year. It wasn't nearly as "competitive" as the 10 year, but I decided that I could go the rest of my life and never see any of them again.
FWIW... my best friend in HS didn't go to the 10 year and he died before the 20 year. That might have something to do with it.