Sparks cash in
It would be great to have a way for partnered streamers to cash-in Sparks.
For instance someone on your stream uses the interactive buttons which those then get transferred to the streamer. Later the streamer can cash them in for swag or for actual money to be dispersed with their normal subscriptions.
Also make it possible for viewers to sub using Sparks. That would be legit.
JJ Kelley commented
The transfer of sparks to streamers is a great idea. Redeeming for money or real items won't be allowed because people can farm sparks using multiple accounts too easily. However, it would be nice if streamers and viewers could unlock additional features on the site by turning in sparks. Something like extra emotes.