Heather Morton has another must read post. This one is on the role of the Art Buyer and really gives us a good look at where the responsibilities lie.
When you read this, make sure to keep in your mind “How can I use this information to improve how I approach/work with Art Buyers?” That way you won’t fall into getting upset or frustrated when you read about the limitations on an AB’s “power” etc. Hopefully you will come away with the understanding that while they aren’t there to be your advocates, they really do want to push their constituents to use the best photographer for the project.