My suggestion is that this step can be implemented for some time and if the results are as you expected then it can be continued forever.
For the different levels among members something different can be taken into account, for eg: their contribution in making this forum a peaceful, user-friendly place or their contribution in any other positive manner. Members can give +1 to each post they like and hence levels can be created. Or anything else that you think would be feasible.
Thanks.
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