It seems that one of the challenges in the SO community is getting specific domain questions answered by "experts" in that area. There have been quite a few times that I have asked things that have little to no views and certainly no answers or no answers that are acceptable. I know I'm not the only one in this. Conversely, I've seen quite a few questions where I have no idea and it looks like (again...I'm not the only one) no one else knows either.
To back up my claim, take an example tag: "java". It has (as I am writing this) ~83K questions with ~11K unanswered or roughly 13.25% unanswered.
Conversely, the sub-domain of java tag: "osgi". It has (as I am writing this) 422 questions with 95 unanswered or roughly 22.5% unanswered.
These are just examples that I have came up with, I am sure there are probably better ones.
SO is a much better venue than the old forums and email list style of Q&A IMO, but it also seems to lack (in some cases) the "experts".
Since you obviously can't pay them :) Are there any other ways to attract talented experts for specific tags, perhaps a "featured tag" that grants bonus rep for accepted answers of low threshold tags?
Or maybe it's all in my head :)