@jwildeboer @morre What about tying the bug bounty amount to the completeness of the bug report?
If the fix is included and all tests are still green, the finder gets the full amount.
If there was an attempted fix but the tests failed, the finder and maintainer would share the bounty.
No fix at all? The maintainer gets the majority of the bounty.
Needless to say, there is a lot of fine print to consider. Also, this method might be exploitable, so it needs strong committee oversight and competent handling. However, it might be a good starting point.