i think one other idea, is that you want a team to function as a team, and not necessarily a group of "individual contractors" (who are in it only for themselve

i think one other idea, is that you want a team to function as a team, and not necessarily a group of "individual contractors" (who are in it only for themselves) as it were... when they feel motivated (and also helped) by those around them, thier individual contribution is buyuoed and multiplied by those teammates (feeling of belonging, trust and camaraderie, can be huge boosters of individual output) (at least this is my experience, you mileage may of course vary)