In reviewing the main categories on the Area 51 home page [Arts, Business, Culture, Life, Professional, Recreation, Science, Technology] I think
Technology would have been quite low on my list as well.
Since the basis of Gamification (or Game-Play integration as I like to call it, avoiding the overly used and sometimes watered-down "buzzworthy" term) is to apply gaming techniques to a non-game situation, I think
Recreation could lead the way, but
Life would be a high candidate for the proposal's classification as well.
However, many levels of Game-play integration have taken the forefront of business and marketing avenues helping to entice consumers to engage more with the company (Four Square) so
Business seems to get high marks in that sense, or possibly
Professional would also fit.
Then again, as an educator and scholar writing a thesis on the integration of game-play within a classroom to teach grade-school students advanced mathematics earlier, I would think that
Culture would also have a foot hold in the categorization too.
I am not certain which one of these four would be better suited for the primary candidate for classification, however, I am certain that
Technology would be lower on the list since this SE site seems to discuss the theory and principals surrounding the idea of Game-Play integration...not the tools used to design the games themselves.