why are people eating these?

the common word to describe these eggs are Horse Urine Eggs.
Chef: What do you want?
customer: Gimme the horse piss egg
They take a mixture of clay, ash, salt, lime, and rice hulls for several weeks to several months, depending on the method of processing. Through the process, the yolk becomes a dark green, cream-like substance with a strong odor of sulphur and ammonia, while the white becomes a dark brown, transparent jelly with little flavor. Yum! more information on the
wiki page