Control the Information, Control the Deal.

Every deal has two sides who each know only half the picture. The buyer doesn't know what's really available or what it should cost. The supplier doesn't know who's looking or what they'll pay. The middleman is the only one who sees both halves at once. That asymmetry is not a trick - it's the entire value of standing in the middle.

Guard the full picture. The moment both sides can see everything you see, you become unnecessary. Your job is to know the market better than either party, so that both of them need your eyes to make a move at all.