With that many leads coming in each month, yes it certainly does make sense to do this. The key with adding team members: be sure you provide value to the agent. If you are "lifting their boat" so to speak, and making it a fair and equitable split, the agent will respect this and want to stay with you.
Our team here in Minnesota works a very, very large number of leads each month. Most of these are buyers off the various MN MLS listings (homes, condos, townhomes, etc)
What is the standard split in your market for a buyer's agent? I would call one of the top team leaders or brokers in your area and have coffee. Find what others offer and make it competitive. Good luck!