If you cannot deal with your own absence of understanding
Lol! I understand very well you're a kid who get his panties in a bunch
You're frustrated and you threaten to rage quit... How mature of you!!
You're just making a fool of yourself, boy.

Suck it up kid, you'll get many other bad luck in life! Just learn to deal with it.

That being said, of course the devs wanna make money with the game. The fact that maybe 1.5% of regular players didn't get any of both boss event girls (you belong to them, tough life!) is possibly an incentive to make these players try Epic Pachinko.
More importantly, their rebalance is due soon. It should deal with the issue, somehow.

Speaking about possibilities: tossing 6 times a dice is a <~17% each toss, getting an event girls is what %, maybe 1% or lower? Great comparison!
"When the wise man shows the moon the fool looks at the finger"