Fix the `sampled_bet` property so that it does not alter the state of the `bets` object

[Adamantios]

          The correct approach would be to fix the `sampled_bet` property instead so that it does not alter the state of the object and read the bets before it's called whenever necessary. I suggest to revert this and perform this change on another PR as it is irrelevant.

Originally posted by @Adamantios in #347 (comment)