I hope not a repost.
It's my first contribution.
In my opinion it is an exploit, because I used it 14 times and always get a Treat Bag, (or I am very lucky, or really work), so if someone confirms that fails, no problem, just let me know in this post.
In my theory and practice so far have taken the following steps to always give me a treat bag when I talk to an innkeeper and use Trick or Treak:
1. Summon Mojo vanity pet.
2. Target Mojo pet and write / kiss emote.
3.Once you become a frog talking with inkeeper.
4.Profit.
5 .?¿?¿?
Note: Once You Have Trick or Treat an innkeeper, you will Receive a debuff Preventing you from Trick or Treating Any Other innkeeper for 1 hour, so make sure you are clean before attempting this.
Sorry for my english, but i speak spanish really.