I am constantly asking real estate agents to include as much information, documentation and pictures of a subject property as they can and to make sure the information is as accurate as possible. I tell them doing so does a number of things including; making them look more professional as many agents include the minimum amount of information, assist their client in selling the property, eliminate a number of phone calls and email questions, provides a better historical record should they relist the property down the road and also helps the appraiser in his/her search and verification process. While I do not do any AMC work I tell the agent's that if an appraiser has the choice of several different comparables and one has additional and more accurate information chances are that is the comparable they are going to use. Even though one of the others may be a little better or have a higher selling price. You can call it laziness if you want but it is also human nature.
On a typical $100,000 residential sale the listing agent will receive 1.5% or $1,500 for a couple hours of work and very little liability. On the other hand the appraiser will typically receive $350 to $450 for approximately 8 hours of work and all the liability that goes along with an appraisal report. Granted there are more real estate agents than there are appraisers, but the agent is making at least 3X's the money for about 25% time commitment. Obviously this difference expands when the value of the property increases.