Confusion about Commission Rebate in Bay Area

Recently I had a conversation with a client in Bay Area wanted to get Commission Rebate and at the same time be presented by his friend as agent.

I know that it is hard for Real Estate Agents to give away their hard earned commission to clients, but sending the client to another Real Estate Agent to collect the commission rebate is not a fair thing to do

It is obvious that the commission rebate is connected to agent, not to the property, 99% of the agents refusing to share their with clients, so it is obvious the 1% who do get more business, more work for less money

Another issue is I sometimes send twits about other agents listings. I am surprised to see some of the because furious and want me to delete the twit. I do not understand their point of view. It does not cost them anything extra and the chances the property get sold increases dramatically. Isn't it the point to hire us to sell the property as cooperating agent?

I would appreciate if any agent explain the point of view of these agents to me. I do not get it!!!!!