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Okay so looking into the step up banners further, if you add it all up, you get the following:
-90 rolls total
-20200 paid gems spend total
Ignoring the gems specials, and buying the largest nonlimited bundle available ($0.816/100 gems), that's $164.87 USD.
So that gets you 1 guaranteed unit, one ticket with a 25% chance and 90 rolls at a 2% rate up, statistically speaking, you should be walking away with a 3/5. I think my math checks out.