I think the key part of that sentence was "I'd like ..."

I can think of several reasons why someone might want to do such a thing.

• They want to begin or enhance a reputation for being an authority in the field.
• They want the organization that they represent to begin or enhance its reputation in the field and to popularize the particular spin that their organization places on such information.
• They are studying the field anyway, so the investment is essentially prettying up their own precis of materials they are reading anyway.
• They want to help the LW community and this is the way they choose to contribute. (For example, if there was interest in the field of law in which I specialize, I'd do the same, but I can;t see that fitting in here.)

Then, empirically, I note that people (who know these fields better than I) do actually post this kind of content here. But I don't see the karma system recognizing them for that contribution as much as being the "editor" of the whatever section would recognize them.

(Subsequently edited for terrible formatting)