I guess it depends on what you think a title should reflect. If you want it to refer to technical competence, then exclude all trading and similar boards. Activity means "activity", and should include all posts if one is being a purist. To take an extreme case, if a guy spends his time selling products, and makes no contribution to any Bitcoin discussions, then do you want him to end up as a legendary poster?

14 posts a fortnight is not a lot, you can hit that just by getting into a single argument about politics.