Note: This takes Luck as the only factor.

Cookie reduces your rescue cooldown by 1 hour. Fortune Cookie reduces your rescue cooldown by 1 hour and adds 1 Luck. The Mechanic can upgrade 3 Cookies to 2 Fortune Cookies. Is it worth buying?

The answer is that you should buy it when you know you can get a certain amount of Luck.

Without using Cookies or Fortune Cookies, you can get an average of 1.05 animals and 0.15 items, over the course of 6 hours.

Base luck Cookie (animal) Cookie (item) 1 Fortune Cookie x2 (animal) 1 Fortune Cookie x2 (item)
0 0.525 0.075 0.352 0.0568
1 0.528 0.0852 0.355 0.0658
2 0.533 0.0987 0.359 0.0781
3 0.539 0.117 0.365 0.0962
4 0.548 0.144 0.375 0.125
5 0.563 0.188 0.393 0.179
6 0.589 0.268 0.438 0.313
7 0.656 0.469 0.667 0.333
8 1 0.5