Before the first spin, nothing is certain
Choosing your bet means accepting results nobody can predict. How often the bonus round lands is not known before you play, and the result of one session is random whatever the RTP. The RTP describes the average return over a very large number of rounds, not the outcome of your next hour.
Checking the RTP means reading past the reels. Which RTP version runs in this lobby is shown only in the game rules, so open them before you place the first bet. Do not assume that a figure quoted for another version applies here.
Chasing the top prize means accepting that the maximum win of Big Bass Trophy Catch is a ceiling reached very rarely. The limit is x5,000 of the bet, so its money value rises and falls with the stake. Read it as the upper edge of the game's payout table, not as a figure most sessions reach.