right now both the minion and mount roulettes let you favorite 25 of all minions/mounts you have. with currently having 217 mounts available that means you can only favorite 11,5% of your mounts to be available on the roulette, i didn't count minions because the number is far greater. anyway my suggestion is let you favorite everything rather than have a tab for your roulette expanding the number of possible outcome for the roulette to anything.