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Kissinger Associates, Tony Blair Associates, Prime Policy Group, etc
They provide value in two ways: 1. Everyone knows Kissing & Blair and they can make introductions to gov'ts to which you can sell stuff 2. I wouldn't be surprised if they engaged in corrupt activities i.e. you're in shit with some foreign gov't, Kissinger knows a guy.
They are basically sales reps for foreign countries. No different from using a sales rep to sell into Walmart or some other chain of stores.
Take your point 2, for example. When I refer to economic value-added, I'm speaking in aggregate terms, i.e. net of externalities. Corruption is an externality.
If you look at it in aggregate, sure, there are middlemen that provide negative value, but that's not core to the question. The question is "why do they exist" - and the answer is "because they provide value to others" (not in aggregate) who see that their existence continues.
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