Let me add some insights when discussing this with a friend. He told me that possibly contributors could get demotivated if a specific contributor manages to g

Let me add some insights when discussing this with a friend. He told me that possibly contributors could get demotivated if a specific contributor manages to get a high stake of the bounty (because he/she contributed a lot). However I believe the opposite would happen: if anything, contributors would be motivated to contribute more, and thus have more tickets. My friend also told me that one of the reasons people contribute to FOSS is because they are passionate about whatever the project does, not because of any financial reward (I totally agree with her). The way I see it, people would still be contributing for passion/hobby, and possibly get some reward on top of that. Not necessarily a bad thing. I also believe that a key to make this happen is to advertise the reward system as a secondary/complementary motivation. If the possibility of a reward becomes the main reason people are there, it may have a negative result (which one?). Also, it's inevitable that some people will have the reward as their sole motivation. Again, I fail to see why this could be bad.