Each month, you have 2 opportunities to predict, I think that's enough to have fun on the AltcoinsTalks forum. Everything else will depend on your luck and the unpredictable volatility of the market ^^
I heard this a few days ago from a famous influencer on YouTube, and he was also saying the same thing as you, like we have two opportunities in the month to predict any opportunity, and obviously you are right; it is nearly impossible to time the market so correctly; in case someone guesses it correctly, it may be his/her luck.
Even the most famous traders don't dare to expect to predict the monthly closing price of BTC correctly, so winning these contests doesn't really mean much to traders' abilities. We can care about the rewards worth a few hundred $, while pro traders don't need that small amount of money, I think they can easily earn it from boring trading activities every day ^^
Indeed, they have big capital, so they don't care about these small amounts; this amount is just like a dust amount for them haha. Those who care are small traders and always are looking for the trading signals to make small profits. I have literally seen people's wallets while trading with millions. So, obviously, they will not even look at these small amount rewards.