Agreed, although for slightly different reasons to some of the previous comments. I just don't think team rewards influence how people play, nor people's willingness to report and/or vote kick. Making it winner-take-all is more likely IMO to see increasingly lopsided, premade-dominated matches, and the freeloaders will simply hope they hit the lucky 1 in 3 at team assignment.
You see this in the mogtome event. If you're prepared to spend 15+ minutes to get either 3 or 5 tomes, then it presumably matters to you to try and get the 5. And yet matches during the event see even more lethargy.