If I play Masterminds, Defenders or Controllers I try to fit in as much Leadership as the build allows. My Blasters and all my melee characters take all primary and secondary powers, there is usually not room for full leadership, but I'll take either Assault or Tactics if there is room, and I can see a benefit. Which mean, I guess, that according to the OP, I play both selflessly and selfishly, depending on the AT. And I am completely okay with that.