The bunnies situation is in part caused by some of the more rare logograms are only available through the bunnies, so if you've already gotten the others, bunnies is the only option (besides the MB). Besides that, there are a lot of opportunists trying to get the mounts and the hair because they are behind so much RNG that you can sell them on the MB for a tidy profit. If SE wants to fix that, they either need to have bunnies drop gold chests more often, or put those items in regular Pyros chest like how the t-rex mount was in Anemos.