That was actually the Prime Trait choice I found most inexplicable in that rule set. It works okay on the table, granted, but if I were homebrewing supers Values would be a Prime, not that set of Affiliations. I'd understand something like it for characters who operate on multiple teams or solo (eg Wolverine might have different dice when with the X-Men, the Avengers, or alone - or even more variations) but that seems more like a Relationship-style adder than a Prime Trait. It's pretty rare to see a Marvel character whose performance consistently falls apart when they're with the wrong number of people. Ones who spike on a team are a bit more common - leader types like Cap A or some depictions of Cyclops - but they also don't suck when soloing or in a team-up book.