As all know Stack Overflow has several privileges that assigns to the users according to their reputation.
Imagine this: I have 2000 reputation, I can now vote to approve or reject suggested edits. Meanwhile I needed to start a bounty because I wasn't getting any answer and just lost 50 reputation. Now I can't vote on suggested edits again.
And my question is: Did my sense of evaluation changed? I just offered 50 reputation, that shouldn't change anything in the privileges.
As the FAQ says: "Reputation is a rough measure of: How much the community trusts you; Your communication skills; The quality and relevancy of your questions and answers" so once awarded a privilege to the user don't remove it because he lost reputation by awarding bounties, that doesn't affect any of these 3 parameters.