http://blog.stackoverflow.com/2010/06/improvements-to-bounty-system/https://blog.stackoverflow.com/2010/06/improvements-to-bounty-system/
This is effectively completed, because
- bounty system is no longer tied to accepting an answer in any way
- you can issue multiple bounties on your question if necessary
related:
How about making it possible to set up bounty on someone else's question?