Did I see it right? The world cup event's just 18 ... @gateio

Yes, you saw it correctly. The world cup event had a prize pool of $5000 and the reward was calculated by taking the prize pool multiplied by the amount of Gateball you invested in the winning side divided by all Gateballs in the winning side. For example, if you invested 1000 Gateballs in the winning side and all Gateballs in the winning side totaled 10,000, then your reward would be $500 (5000 * 1000/10,000).

This is the announcement: https://www.gate.io/article/28707

Reward = the Prize Pool * (Your Invested Gateball / All Gateballs in the Winning Side)