I've got a few:
Aggression potions underwent two stealth nerfs to make them less effective. It was never announced to players to avoid backlash. Original aggression potions had a much stronger effect, like the aggression ability, giving instant aggro on every monster spawning nearby. I think it was first nerfed for how often it triggers, and then nerfed again for the range of effect.
Jagex secretly injects partyhats and other rares in low quantities into the economy, because otherwise the circulation would completely dry up after 20+ years. Too many rares are stored on inactive accounts, and players would realise eventually.
Loop half of a key is slightly more common than the tooth half of a key. Back in the day on the forums it seemed everyone had an opinion on this, coming from personal experiences. But the "loopers" always outnumbered the "toothers". To this day I get more loops than teeth.
There are bot accounts logged in 24/7 in crowded places like GE or at portables, collecting player names for the fake J-Mods "we noticed maturity on your account" phishing accounts to contact you. They pass on hundreds of names automatically to check who has private chat enabled.
Jagex participates in the underground rare name trading markets, freeing up desirable display names for trusted friends. If you have inside connections, you can get a "rare" name.
Luck rings and other luck enhancers actually do nothing for content from about 2012 onward, including all EoC bosses and high level Slayer drops. It's a massive noob trap and a waste of ring/relic slot, perpetuated for a god knows what reason. The only thing that's affected is RDT and very old boss drops like Dchain, GWD1, and Corp beast sigils.
Many content "leaks" are done by Jagex on purpose. For example, Sonic Wave icon was changed well in advance to get players speculating about Greater Sonic Wave, because this kind of buzz spreads faster than any livestream or website announcement, and keeps people curious about upcoming updates.
Drop rates of rare items are boosted on release day of new content, to quickly get some items into the economy for players to try out and for "content creators" to show in videos/livestreams. Afterwards the drops are adjusted to target probabilities. Early bird gets the worm.
Returning players get better loot in treasure hunter to get them hooked on the game. Free players especially have a higher chance to get high value members' prizes to get them playing and get them to subscribe.
What strange things do you believe to be true about RuneScape?
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