"With this campaign, I can get 2 UR units if I try a 100 times"
That's not how gacha works.... If your bad luck are high enough, you can get 0 UR instead.
Now i'm interested to see an online game that instead of Universal Stamina/Energy system, it has Individual Boredom/Fatigue system. A character/unit will accumulate Boredom/Fatigue each time they clear a stage, and will suffer debilitating penalties based on how much it had accumulated. This of course would kinda invalidates auto-play-grinding, tho it's not like i'am a fan of game that relies too much grindfest to prolong game time anyway.
@NightSide, there's some event gacha that came with a "failsafe", that is, if you didn't get any UR/5* etc for (high) numbers of pulls, you are guaranteed to get one on your next pull. The value of the failsafe-trigger will then reset everytime you pull a jackpot.
But yeah tho in his case, he was being too "optimistic" with the worst-case scenario, lol.
“UR rate doubled for duration of the campaign”
R.I.P Wallet
No UR
.......a day later.....
“Step Up summon: Guaranteed UR on 5th step”
*FLIPS TABLES*
(ノಠ益ಠ)ノ彡┻━┻
┻━┻ ︵ヽ(`Д´)ノ︵ ┻━┻
.
.
.
Rinse and Repeat
@Haremmony this system is there already isn't it? like in AZL or Kancolle, if you farm too much with that unit their moral/sanity will declining and their stat will go down.