That look likes a rather large egg. In egg classification, in UK at least, the class 'very large' is >73 g. so lets say it is 75 gram. Price of gold right now is 1164.5 USD /oz, so the price of 1 75 g. egg is 2808.28. 6 of these an hour, times 24, times 365, is 147 603 183.28 USD
So they are actually making a profit! And yes, I think solid gold eggs, it would not be worthwhile otherwise.
How is it really with these golden eggs, is it just a thin shell of gold filled with ordinary albumen and vitellus or is it all solid gold? I wondered about this ever since I heard about them in fairytales as a kid.