The major issue, is that BB is a private forum where ideas are shared. In order for that to work, there must be a certain level of trust, and integrity, soas more advanced topics can be covered.
In BB we have quite a few webmasters that actually get some work done, not just armchair webmasters that spend 90% of their day pretending to be webmasters on forums (which I've noticed is the case in BOTH adult, and mainstream)......so as people prove themselves, more advanced topics/techniques are introduced to them, so that we may all work together. Each individual, that is part of the whole, then becomes stronger than they could on their own...........but there is a limit to that, it can't be 5000 new people doing it half assed.
This tutorial, really is not the full issue, others would have eventually caught on, etc, which is fine. The nature of biz on the internet. The real issue, is the lack of respect, and integrity, it takes to pull these concepts from somewhere private, and make it public, and take it as your own.
The only benefit of doing this is to make yourself look brighter than you are to a different group that you are trying to impress. It wasn't done for the overall good.
It has nothing to do with this being someones only source of income, this was just a niche, within a larger niche, of traffic generation.
I seriously doubt anyone in here will share a list of the adwords keywords that make them money, so that everyone else in the forum would benefit from them. It would kill their campaigns, or at least make them not as profitable.