Instead of discouraged, I would say just not encourage it. It should be made clear that no matter how much you value your topic, it could still be unworthy. I would hope but won't hold my breath that people maybe add to older topics that have seen longevity or shown purpose rather than create new ones for this purpose.

More than just reviewing the rule you can follow theymos's quote back to the topic, where there was a bit of discussion surrounding it.

The rule was seemingly put in place after discussing it with dogie, who if your not familiar with created a ton of the original "How to for Miners". Which was without a doubt very useful information. There were also some examples of threads that were deemed not worthy put forth by ..... ummmm ..... well you can read it.

Honestly I'm not against this. If there is a substantial post that I get something out of that somebody creates and possibly maintains, then by all means earn a little something of advertising. Ideally we could some up with some guidelines/limitations on the formatting that'd be great.