I think there are a few things you might have not thought about; everything is not just a simple dollar sign believe or not -
First, as a Realtor, my goal is to build long term relationship with my clients. A person may change their homes several times in their lifetime. My goal is to be their Realtor for all those homes, both buying and selling. The only way I can accomplish that is to provide the best service, to help them find the best house for the best price that they would love. They might even want to recommend me to all their friends and relatives
Second, I want my clients to eventually become my friends and I can't make that happen if I am only after money.
You'd say, sure, that's sounds good and noble, but do I really trust you? So,
Third, we can get down to the core of your question and do a little math, as that's why you asked the question.
For the sake of easy math, i am going to assume that you are buying a house for $700K (I am in Marin); and the seller is offering 5% commission. The norm is listing and selling agent split 50% / 50%, so, my brokerage will be getting $175,000. I wont' go into how an agent split with the brokerage, as that's normally by production level. Now, let's say that you want to offer $650K and was accepted. The commission my brokerage gets will be $16,250. For $50K difference in offering price, we are talking about a difference of $1,250 in commission which, again will be split between brokerage and agent
Do you think I will let you bypass a $50,000 saving for a maximum of $1,250 on my companies commission ? (much less for me due to the split). No way, it's not worth it. You would like the whole experience so much better if you can get a $50,000 discount on the house and I will have so many more opportunities to work with you in the future.. On top of that, you might like me well enough that you';d recommend your friends and families to me. '
So, now do you see why the majority of the Realtors will not try to talk you into paying as high as possible? Honestly, not only is it not to your advantage, it is also not to their advantage.