Very good post. I feel ashamed of my self that I have not utilized the advantages you pointed out in regards to zip codes.
As frustrating as it is, there's two things that you need to consider when people are trying to get you to come off of your price. I hate saying this but it is the truth depending on where you're at in the valley according to your ZIP Code is going to give you a different demographic for every single ZIP Code. And again I'm not trying to say that to sound rude or heartless but it is the truth. The demographic that's appealing 85001 is much different than 85331. Number two whoever is the buyer essentially has an inherent advantage over the seller, even though we as the sellers own the items the buyer knows we want to sell it. That changes their perception of the value of the sale. Anyone out there that's having issues with people constantly asking you to come off of your price change your ZIP Code for the sale and you will incur less of this.