There's nothing to worry about, Easter eggs are not meant to be discontinued or hold much value so every holiday event JMods go around and spawn thousands of holiday items such as Party hats and Christmas crackers during Christmas and Easter eggs during Easter.

AnotherPSA

They are not meant to hold value yet 10k and counting are being sold right now because they are of value, more than any day in the past 6 months. One they fall to below 2k people will scoop them up and hold on to them to inflate prices for when you finish spawning them. Once Easter is over you'll see over 10k being sold a month before the next easter while being bought for under 2k. 2k gp per egg adds up fast in a flip, especially on an edible item that is cheap.

If they were never spawned every holiday event, they would only get more and more expensive and pretty much become "discontinued" which is what we would like to avoid. They might hold some value, but it's definitely not in the millions compared to what they are in RuneScape 3.