IMHO, a person, who first notices that a closed post is improved enough to be reopened, deserves some support. What do you think of series of medals? Let's call such person 'Initiator'. I would count in both first reopening vote and reopening flagging.
- (Coin Seeker) Bronze - for every question which reopening was initiated and reopening was accepted, at least once answered and together with its answers got 5 votes.
- (Pearl Seeker) Silver - for every question which reopening was initiated, lately accepted, and together with its answers got 15 votes.
- (Diamond Seeker) Gold - for every question which reopening was initiated, lately accepted, and together with its answers got 50 votes.
Reasons:
- It encourages positive behaviour. More people will help with advices for editing.
- It gives users an incentive to explore the site for improved questions
Edit (as reaction to @ben is uǝq backwards
post):
Another variant I thought of:
- (Good?) Bronze - for the first question which reopening was initiated and reopening was accepted, and lived for longer than a week.
- (Goodness) Silver - for the 10th question which reopening was initiated and reopening was accepted, and lived for longer than a week.
- (Saint) Gold - for the 100th question which reopening was initiated and reopening was accepted, and lived for longer than a week.