Why do I have to build a level 5 coal mine on my island to finish this quest? For levels above 45, our islands are set how we want them. The logic for these events lead me to believe you want to change how we like to play.

I thought it was a joke to "acquire" 800 eggs as a casual player, but I chugged along and finally got them. Now I am hit with building a level 5 coal mine (I don't use them) on my island to finish the event quest.

I'll see what it takes for levels 4 and 5, but you really have made this event quest worthless to complete. Thus you have made the event into a trading event, which is more than likely your end goal for it.