Seriously, agents are not the enemy...we are not playing games and want the best outcome for our sellers and for our buyers.
Here's a thought.....if all agents adhered to a standard of being able to say, I'm sorry but I can't take your listing under these terms....don't you think they would eventually get it!
As a real estate authority no one should sell themselves short......no, should be in our vocabulary.
You can accompany your offer with the comps or other data you used in coming with with an offer lower than the seller's asking price. Your Realtor can advise you further on that.
Hope that helps.