Well...
Having someone respond to all the posts about things that don't work would required a person. A person with knowledge.
This person is either
1) an extra hired person
2) a very good citizen that works for no money and has superior knowledg about a lot of stuff
3) an actual dev
If it's an actual dev, that means they have to take time to answer everything instead of work on fixing it all
If it's an extra hired person, well finding someone like that i'm sure is hard to come buy, especially for them to have knowledge on all subjects
And if it's number 2, well that's just a miracle isn't it?
*edit* Also, I like that they have message boards, but I think their /feedback and /bug system is more versatile. People can only do so much.