What a single session can return
Staking on Wild Wild Riches also means accepting what nobody can see in advance: how often the bonus round comes. Each session ends where the random results put it. The result of one session stays random whatever the RTP, so a single session tells you little about the next one.
Picking which version to play starts in the game rules, because only there is the RTP running in the lobby shown. The series has several versions with different RTPs, so compare the rules of the one you open before you stake anything.
Weighing the top prize means reading the maximum win as a ceiling, not as an expected outcome. Reaching that ceiling happens very rarely, and no one can state the odds of it in advance. Set each stake by what you can afford to lose, because the ceiling does not change the odds of any single spin.