If you are not serious, the agent doing the CMA would be well advised to simply provide you a statistical justification of price.
If you are serious, and have intention of selling your home, the agent will need to dismember the componets of each sale and apply value analysis.
However, of greater value, is understanding how a potential buyer will evalutate your home and how Bank of America will treat everyone. This aspect of understanding the home sell process is what makes for easy, conveinent and drama free transaction. It is this analysis the represents the reality you must embrace and for which you must prepare.
How will you know the difference?
If you are serious, you will be presented with a side-by-side comparison.
When you are up to you eyebrows in data, you will become aware, pruchase decisions are made emotionally, and justified logicly. This means, selling your home for top dollar is as much art as it is science.
Did your agent look at your home and then preview the CMA homes? If you're in Waverly Woods, for example, and the other properties are not, you could have a legitimate case that the comparables are not the best.