I forget where I read this... set off your fire alarms every now and then and give your pets treats. That way they come looking for you when the alarm legitimately goes off.
Hm. You actually made me look at it, and it indeed does look interesting. Somehow, I always had an unfavourable impression about BountySource before; now that I think of it, possibly because of clunky GUI? Or, I believe it may be that the "capturing/overlaying" of GitHub Issues they do feels uncannily scammy to me?
Edit: don't fully understand it, but somehow I have a feeling it'd help me if I saw people behind the project emphasized more? I now remember I also supported the Voxel Quest author (Gavan Woolery) via his project. The "regular" (non-Kickstarter) one however was Calibre.
As far as I understand, Salt would only need one addition to move things towards this proposal: allowing project maintainers to make a list of bugs/features that monthly contributors could vote on.