I am looking for an idiom or a phrase that expresses the opposite idea of "the more the merrier".
Five persons are taking a class in gymnastics with a private coach. Only two show up for the training session. Person A: "Hey, [the opposite of "the more the merrier"!"
The intended meaning is the two persons will receive more attention and useful advice from the coach, so the session stands a good chance of being more productive.
Ideally, the idiom should be usable in the example sentence above.
Note: I'm aware of "less is more", but I've heard it in the context of minimalism, and it doesn't sound like a good candidate here (correct me if I'm wrong.)
EDIT: "The more the merrier" is actually abbreviated. Originally it was "the more the merrier; the fewer, the better fare", where "fare" means food. One could of course simply say "the fewer the better", but I'd like something more colorful, if possible. And "the fewer, the better fare" sounds a bit opaque (again, correct me if I'm wrong.)