I think this might be too silly to actually happen but I do enjoy the idea quite a lot
That's fair - I don't envy the devs, I feel like it's hard to find features that are interesting enough to add as plus benefits without being too gimmicky/silly
Newgrounds does this! Although it isn't explicitly moderated it's still pretty funny to see. A rotating pool could potentially get stale, so instead have a minimum timer for a splash message to be in use before another one queued up takes its place. It might also be worth doing what newgrounds does too - which is listing the user who submitted the message. That latter part might be prone to turning into an attention-magnet mechanism, so it's understandable if it's not outright implemented.