We see a lot of bounty questions asked by people who are only her when they have that question and never help around with answering, commenting or even as much as voting.

Now since they don't do the above they have less then 50 points of reputation, and yet they can ask bounty questions of 50,100 and I've seen a few of 200 points, in which they get a higher priority of answer.

My Question is how and why is it possible? And should it even be possible?