I'll always team up for TEs. There's simply no reason not to. Most people I encounter have similar attitudes.

Once the farming starts, it's each their own. As a PUP, WS mobs are about as good as JA mobs for procs, so I usually can stick with smaller unpopular camps and have little trouble with others. I usually don't grab yellows (proced or not) near other players, incidents or lack of mobs aside.