I'm not a whale, but I did spend the night in a Holiday Inn Express last night. And in the 1 1/2 years I've been playing I only ever got exactly what I wanted, once. It was Federation Onmyoji Rimuru, on the first try. It was only a couple weeks ago. I'm waiting for the Mandela Effect where I'm returned to the Universe where I got another copy of Myrd.
I did a bit of math and it's not as bad as it looks on the first glance. On multi 1-9 you got a 1.258 % chance to get any EX unit and a 0,37% change to get any EX prot. Meaning that the chance you pull an EX there amounts to around 1,6% while regular banners are 0,7% for each full featured and 0,4% for "side featured". The 10th multi is a 1% for each Ex prot so a 10% chance total. And then there's the 30% ex after 3 multis. That said the pool is super diluted and especially if you're not missing all of them there's a low chance you get someone you actually want.
Saving for the mythical summonable Geld unit that will ONE DAY drop in this game. He's my favorite unit, and I think the only major character that has yet to get a premium summonable unit. 4k Crystals and counting!
Kinda done till 3rd anniversary and in full save mode, mostly have all units I need now so unless something ground breaking comes out like vengeance was, just going to save up.