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In the Help Center
To avoid overly promotional bounties, if you are offering a bounty on a question that you have already posted an answer to, your minimum spend is 100 reputation (not 50).
I don't understand, it also states
You cannot award a bounty to your own answer.
So, what's the point of requiring a minimum of 100 reputation points?
You cannot award a bounty to your own answer, however by posting a bounty you can generate considerable attention to the question. Which in turn may give you more than 5 upvotes equal to 50 points (considering the quality and usefulness of your answer). In a way you invested 50 points to capture attention, which may give you more reps (profit). To avoid this kind of rep harvesting, this restriction is in place.
