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The person you are giving as an example has more than 200 reputation on others SE sites, so she or he had a +100 association bonus when coming to TEX S.E. If you add his 17*10 reputations gained for Q&A on this site, +4 for accepting answers and 1 initial point, you have a total of 275 reputations before he offered those
three bounties.
From TeX S.E ...
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Bounties are great! Showing appreciation to posts by bounties is great!
There are possible ways of bounty fraud, such as
shifting reputation to another account by bounties a lot
circular bounties (moving rep point to another account, and that account moves it back, costs zero but a benefit may be visibilty and so gained rep/badges)
What that user now does,...
Only top voted, non community-wiki answers of a minimum length are eligible
