Foum bumping

I am asking out of curiosity really, but why are we not allowed to bump our threads in the clan section of the forum? I mean If a clan writes a recruitment thread and it gets no posts for a few days and disappears out of eye's sight, what is the issue with giving it an occasional bump?

I understand rules are rules, im just curious to the reasoning behind it. I would personally rather bump my recruitment thread once a day than to have to write a new one out every other day.

Thanks in advance.