It also gets increased chances if you have eaten proper Breakfast. :S
All rumors to make people think they can control what is fixed everytime.

You just didn't present a proper sacrifice to Random Number Goddess, so she reaped the remaining value with your tears, and will continue doing so until your debt to her is fulfilled. Next time, before attempting a gacha, do a proper blood sacrifice of a hundred, and only then she might entertain a though of granting you some small sliver of her blessing