I don't think that's bad that items cost a bit... it's a bit ridicolous to see the extremely low cost of some event items, because they were too easy to catch, so I'm happy that this time we have something a bit more challenge! Be able to get all the items in one day as lately it was isn't so exciting, while in this event we have to work to reach our goal!
By the way, I don't know how much past events' items cost, but you can find an egg very often in this event, so cumulate all the eggs isn't too much hard
