I'm not even collecting from all my ticket droppers anymore, because I don't have enough free royal exchange time to convert them into permits. I could make 4-5 permits per day, but I also need to convert those into explorer or wind chaser permits and I still want to do the golden exchange every night for gems. What a luxury problem to have! I still pick up all ticket droppers from the tent and events though, it used to be a very very scarce resource and I believe in abundance all round in this game, you never know when you might really need it. One day S8 might invent 20 explorer permits plus 99 trade tickets and a gazillion coins for an expansion!