Buyers agent commission

[Brian Phillips]

I am submitting a hud offer on a home as an investor. What is the lowest acceptable commission for a realtor as the buyers agent? This agent has showed me 2 houses, and done 2 cmas for me. I found all the properties I am interested in. The hud agent gets 3%. Can I offer 1.6%. The net to hud on this transaction is around 140,000, so the agent at 1.6% would get around 2300 commission for his brokerage. 

What is the lowest you have ever negotiated to (commission wise)?. If the agent brought me the deal or had more time involved, I would feel the realtor was due a larger commission.