I help out alot of people for free even if they are buying from another realtor, simply because I want to be the go to person for all of their real estate needs. I know if they are calling me to do a price analysis then they must trust me more than the realtor that they are using which is a very good thing. If another realtor brings one of my buyers a great deal, then its no big deal, more good deals will come along.
I would guess that alot of investors in the forum have one good realtor that they go to see. Not that they always buy from, but one that they trust. Is that the case?