I would not mind RNG if this event was not Limited to 1 Bag a day per char. So basically if you ONLY did the Prem bag each day, you only get 13 chances. It would be different if you could get more, but limited to 13 chances is very low.

And its also different because there are other limited rewards, Snowman Minion, only obtainable via this (possibly available in the future via Mog Shop)

Hopefully they do not make events in the future as limited as this.