It's been a while since high school biology class, and I can't ask my sister right now, but I don't think humans are born in eggs. What does an artificial egg hatching chickens have to do with cloning humans?
Technically speaking, we could engineer it in a way where humans are born from eggs. It would just have to be a very big egg and would also have to continue growing in an incubator after hatching much like chickens rather than the standard womb senario.
Surely the rarity is partially due to the velociraptor skeleton cartel limiting the supply. And really, a velociraptor skeleton wasn't even a traditional engagement gift until they created the demand for it with that advertising campaign back in the day.