Zack enjoys these.
Eggs are often collected by Zack. He sometimes uses them to make cakes. He finds them commonly, especially after the Chicken Invasion. He seems to find a challenge in collecting them. In Episode 445 - Burning Chicken Zack makes sure he collects egg from the easter basket before it's destroyed. Episode 457 - Bedtropolis sees Zack collect an egg on his way to Bedtropolis. Other players with a notable penchant for eggs are evilmacaroon and SwimmingBird941.
Yolk's On You! Souvenir Stand located in SwimmingBurg, is a well known egg retailer.