I was/ am thinking about doing it in my neck of Colorado but... The rules for my local farmers market said any sales over $5000 needed to be FDA inspected. Ok no problem, I'll stay under $5000.
Then I started thinkng about it some more:
I would imagine that it would be a hot item since nobody else does it. I think I could easily sell out with 10 doz in the space of a couple hours, now do the math - booth space is negligible for my area, let's say $10/week. Sell 10 doz eggs - lets be optimistic and say we're getting $3.50/doz for them. OK $35 - $10 space = $25 profit for two hours work (provided I can leave when I'm done selling the eggs, some places have rules about how long you have to stay) The hard part would be getting 10 doz eggs to sell every week. I'm going to be conservative here and say that I can get 4 eggs/week from each chicken, that is 30 chickens just have selling eggs let alone what I want to keep/ give away. And that only satisfies 10 customers if they buy a doz each.
I'm not that big yet. I think it can be done, but make sure you run all the numbers and don't end up actualy 'giving' them away.
ETA: Right now I can sell to friends, who know I have chickens, for $2.50/doz, still make the same amt of profit I would at a market , and not have to mess with all the rules or devoting every Saturday to do it.