Think of it as the Gluckons and sligs more as police and the authority, whilst the bounty stores are more Clakkerz trying to get ridd of the people troubling them, since they have no real police so to speak, or bounty hunters act as a force outside of the law.
It's probably not ethical that a bounty hunter is sent by Glockens and sligs, and their type of industrialists, who are the ones who want to go after abe, maybe if it was kept quiet it would happen, and they wouldn't let the Clakkerz take care of it anyway.
As for a slig doing it, as I said, they're like police, so they have to take care of abe anyway, preferably dead, since he always manages to escape.
The big difference is bounty hunters have a choice (so to speak, Stranger didn't realy), but police/ security officers like the sligs don't.
That being said, a slig wouldn't become a bounty hunter, becuase they're liscenced to the Gluckons.
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