One way to increase your chances of collecting more 5 star items in the wishing banners.
This points to the 10-pull option being way worse than you think it is as the wishing system is distorted to make double 5 stars back to back more probable in the price of lowering the probability for the next pulls until pity is reset so you would need 104.5 more pulls on average to get the next rate up 5 star making you spend way more Primogems.
