I could be wrong, but it seems like a bounty text should go away after the bounty is claimed. Lots of bounty text is used to have a message you want perm stuck there, which I like too. I wouldn't mind having the ability to remove a claimed bounty for 1000tc or something. It was a pain to have an old bounty text removed, had to pay another user to add a new bounty to get rid of the old one. If bounties are perm until you replace them with a new one I feel like they should cost more. Maybe there could be different length bounties for different costs or something.
I have seen some pretty unfriendly bounty texts, but that's just part of playing online games. I only was annoyed by my last bounty text because everyone seemed to think I had put it there myself.