If you are discussing variances of a few percent in team size, sure- there is an optimal size and it may be smaller than we expect. But do you really expect you could write a project the size of, say, Linux or Office, with a four-man team faster than a hundred-man team?
Even if half the latter team is utterly useless, and the team runs 10% the efficiency of the four-man team, you still have more production power. Obviously it costs twenty times as much, but as a previous poster noted, sometimes that just doesn't matter.
Even if half the latter team is utterly useless, and the team runs 10% the efficiency of the four-man team, you still have more production power. Obviously it costs twenty times as much, but as a previous poster noted, sometimes that just doesn't matter.