I have not been able to demonstrate to myself that ANY of Plarium's "odds" ever work out as expected. I think it is all a bunch of hogwash. The ones that get good stuff wonder why, cuz it is not RNG, and the ones that do not get good stuff wonder where is the RNG when I needed it? Evidently the common Mantra here is that "odds" are not real odds since it is all RNG, haha. Whatever you try to demonstrate for yourself, either good or bad, is fruitless cuz you will never have enough "sample size", so when it comes to odds, just forget about them.
We have no way to know whether anything is working right; potions, artifacts, champs, you name it, It is all just a crap shoot. At least the casinos have some oversight over them that whatever odds they publish are in the right ballpark but nothing like that here. Fat "chance" of ever seeing that in Aristocrat's Quarterly/Annual Report.