From what you say, I think I misunderstood how local merit sources work. I thought they were limited to give a certain amount of merits in that specific local board. Isnt that the case? If it isnt, I think I made mistake when I applied to be a merit source, I should have applied to be a local merit source. I didnt because I spent much more time on the English section than on the Spanish one, although I visit the Spanish one regularly.
I don't think there is any particular restriction or rules about it, as long as your 'job' as a merit source is consistent with the reason of of you gave in the application.