after you reach a certain level like say rank 100 i am thinking you should be able to get a secondary profession you choose which profession you would want as a secondary and it will give you half of the bonus of that usual profession example currently i am a human raider if i get a secondary profession of say explorer it would usually give me an extra 10 percent scanning power but since its my secondary profession it gives me 5 percent extra scanning power. is this a good idea or am i off base?

Last paragraph of Tiered Professions.