I have bought leaf tickets occasionally, usually when they have those limited time offers, but my biggest issue with leaf tickets in this game is just that I feel the economy is broken.
Or, to be more specific, it is designed to not really give the average player much value for your purchases at all, but rather extract money from the whales who have money to burn. It's emblematic of mobile games in general, and really sucks. I genuinely want to spend money on this game which I've played for 2 years, but they aren't giving me a good reason to outside of those occasional deals.