I have an idea for solving the double posting predicament Legodac brought up: Instead of 'paying for it', the person who made the last post in the topic has to wait a day to make a new one, unless somebody else posts in the topic before 24 hours are up. That way, good topics won't be left hanging.
As far as rep is concerned, I don't really care what happens to it, so long as it isn't abused.
The problem I see with this is tha a mod still has to enforce it.. and send a PM or something.
As far as I can see the deleting the second of two posts by the same author is working fine... the punishment is that because they did not modify the first post, their words do not get seen by the forum.
I am pretty sure that people who care will learn to remember to modify. And as always, if a bump is needed, pm a staff member to make a bump post...