Would you forfeit .3% of your commission on a $425,000 sale?

If you were the buyers agent and the only hing holding up the deal was 2.5% commission versus a 2.8% commission would you kill the deal?  I am just trying to get an idea of what that means to most of the community.  Is that additional .3% on $400,000 so important that you would not help your buyers because you will only receive 2.5% commission?

Jim