Just to officially confirm what other people have said, yes the "income" skills (Apprentice <x>, Journeyman <x>, and Master <x>) only provide income once a year, and do not count towards the limit of 12 skills (although you continue to be limited by the amount that will physically fit on your character card).
These skills may also provide other benefits on an ad hoc basis at ref discretion, but you should not rely on this happening.
Anticipating some common followup questions - yes, it's a meagre amount of money; yes we're aware of this; yes, it is possible that the amounts will be revised upwards in future; no, I can't guarantee that, or give you any indication of how likely it is to happen.
Rich Whitaker
Forum Moderator (yes, that means this post is official unless it explicitly states otherwise)