Obviously the forum's most favorite "sport" is debating about Bitcoin's price/market, and trying to predict other coins' prices. Perhaps Shuffle's next promotion in BitcoinTalk should be centered around Bitcoin price predictions? A promotion on guessing the price of Bitcoin during the next halving would be very very good. I'm confident many people would be happy to give their predictions, with or without a prize.
Or if you want it to be more educational, maybe a prediction of the month when Jerome Powell decides to pivot from QT to QE. Everyone also loves debating about that.
Just like I suggested yesterday, because such a form of promotion gives members the mandate to register for a d test around the casino and thereafter give their honest reviews about the project here in the forum, this form is a short-term long-impact promotion