The forum must create it's native token and distribute them to members based on their activities.
This forum was found and created because of Bitcoin discussion and other technical stuff regarding Blockchain, we don't need a fancy token because the forum has already a digital coin and that's Bitcoin.
Tokens must be transferable among forum members but should not be listed on any exchange.
It seems you mean this is a merit system, but it doesn't mean trading merit between users. It will be awarded in good posters and this will help to clean the forum to illuminate spammers that never rank up.
This will also prevent scam projects from running bounty and running away without paying.
I have a better idea: let's just close the bounty board

I tend to agree.