Um and just out of curiosity are you guys that are for feeding eggs to chickens vegitarian or vegan; if vegan why would you choose to not eat eggs yourself but still feed them to another life form...
To my understanding, when hens are left to their own devices they will often eat their unfertilised eggs - for the nutrients (especially calcium). It requires nutrients to lay eggs, and so egg production is physically demanding on their bodies. So if an egg doesn't serve it's intended purpose of producing offspring, then the hens can benefit from recouping some of the nutrients they've lost by eating the eggs.
I agree, it seems odd and as someone who doesn't eat eggs, I can't say I'd want in on the action. But if it's a natural behaviour that is beneficial to the hens and does not cause anyone any suffering (and in fact may prevent hens from suffering calcium deficiency, and thus brittle bones), then it doesn't bother me.
On a related aside... I've occasionally had conversations with friends about whether I'd eat eggs if I had backyard chooks. My answer is usually 'no, but I might offer the eggs to a neighbour who would otherwise buy cage eggs'. But I was intrigued a little while ago, when a vegan friend made the case to me that if she had hens she would leave the eggs for the hens - because the nutrients from unfertilised eggs can play an important role in ensuring they don't become deficient in anything. I thought this was an interesting argument to make.