Reading the RTP version ahead of any stake
Choosing a stake on Big Bass Halloween 3 does not tell you when the free spins will arrive. How often they come is not known in advance, and nothing in the rules fixes it for a session. The result of one session is random whatever the RTP, so two players with the same bet can end with very different balances.
Before staking, find out which RTP version Playamo Casino runs for Big Bass Halloween 3. The version is shown only in the game rules, so open them before the first spin and read the figure there.
Weighing the top prize against your bankroll starts with the maximum win. The maximum win of Big Bass Halloween 3 is a ceiling that is reached very rarely, so treat it as a limit on the prize, not as an expectation.