If you plan to sell eggs, check your state's regs. In Ohio, I am obligated to keep my eggs clean and below 45 degrees at all times. There are rules from the Dept. of Agriculture and the Dept. of Health. I wash eggs with detergent and they have a bleach water dip before sale just to make as sure as possible that there is no salmonella, etc. There are also strict requirements as to what must and can't be on the carton and in my advertising and how I keep records.
I really hope that everyone who sells eggs will follow their state's rules. There are already movements in Congress to clamp down on backyard/small producers, and agri-business is supporting them. Please don't give these folks any ammunition.
Eggs will last longer at refrigerated temperatures. When people didn't have refrigerators, they preserved eggs by dipping in wax or oil, or by burying them in cinders or sand. I understand that a non-washed egg has a protective coating, but in my mind it's better to destroy that coating by washing than to send out even a potentially tainted egg to my customers. Liability insurance is VERY expensive. Also, b/c store eggs are often so old, people are conditioned to use up eggs within a month anyway.
eta: Not all cooking is best done with room-temperature eggs. A foam made with cold egg whites won't be as high, but is much more stable and better for my favorite--angelfood cake!