I think this song categorizes friendships into two kinds, depending on the person you're dealing with. I think it treats caring people as the real kinds of friends, and other people who don't really care as more interested in their own gain - see "They'll meet you when your ship comes in." the song doesn't use imaginary in the literal sense, but more as a way of differentiating caring friends and careless people who only want to move up in status using who they know as leverage.
I think this song categorizes friendships into two kinds, depending on the person you're dealing with. I think it treats caring people as the real kinds of friends, and other people who don't really care as more interested in their own gain - see "They'll meet you when your ship comes in." the song doesn't use imaginary in the literal sense, but more as a way of differentiating caring friends and careless people who only want to move up in status using who they know as leverage.