People who have studied the issue say that the typical iPhone user runs 5-10 programs, so I would think that those would be more important than however many the users have available but don't use.

I'm reminded of an old chess story. Someone asked a chessmaster how many moves he thought ahead when he was playing. "Oh, seven!" came the impressive reply. Then they went went to Capablanca, a long-time World Champion, and asked him how many moves HE thought ahead. "Just one" he said simply. "But I make sure it is the right one."

So quality trumps quantity every time.