Could be a viable competitor to Yahoo Answers and other help forums.
Google Answers was awesome for answer quality, if you were willing to pay. Unfortunately, they no longer exist. I haven't found anything that fills the void they left.
The only viable option is for it to be a part of a larger self-policed community, with no 'points' that count for anything: http://ask.metafilter.com
We built it to exactly fit that niche: smart people, good incentives, and free.