Purchase emote slots as a streamer
Im an affiliate & its hard to get partnered to get more emote slots. i already have all 12 emotes (affiliate unlocks and bits slots) i would honestly like to have more emotes to unlock that would be really nice since me and my community uses a lot of emotes for expressions. This will not change any benefits compared to partners because we are not using their emotes we are creating our own to represent our channels and express ourselves. So having the ability to purchase emote slots as a streamer will help its a win-win

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Qarklar commented
Allowing streamers to pay a monthly subscription for more emotes.
This is mostly aimed for larger streamers but can similarly be used for smaller ones, where in both instances they have to many emotes and not enough slots.
Adding in a monthly subscription, be it paying X for Y slots or you pick Y slots you want/need and they cost X total.
That way there's a bit more income to help offset the costs for housing the extra emotes and at the same time, it allows streamers to have more emotes available to share with their viewers and Twitch as a whole.