You want your customers to easily decide between different types of reward boxes based on their theme and contents alone. Constantly shifting the percentage chances for different reward tier chances and introducing ambiguous value propositions will lead to confusion and discourage players from spending.
Set up rules around the distribution of reward tiers inside your premium gacha boxes (for example, a 2%/12%/86% split between legendary/rare/common items) and stick to them! Inconsistent tiers will not only make your life harder (more variables to set up and balance), but they'll also make for less satisfied customers.
With consistent offering, a player who wants a new warrior class character can instantly choose a ...
