I agree with the previous posts. The one thing I think that has been left out is the importance of building relationships with other brokers/agents.
Broker Open Houses are a great place to meet other agents (many of which you have probably spoken on the phone with or even texted with previously). It's helpful to put the face with the name! Yes, these other agents may be able to help find the buyer for that listing, but more importantly, they may be representing the seller/buyer in your NEXT transaction. It's no secret that agents want to do business with other agents that are most like them. When you build rapport with the agent community, you create an army of agents who want to show your listings! More showings = more sales.
The relationships with agents that you build over time will prove to be an asset to your clients.