Hmm, good question. Maybe Merlin tries to pull some strings and try to get him a good position in the big house, but maybe Will is quite comfortable working outside with the stableboys, or something. He likes the camaraderie. Will does get teasing sometimes, some less affectionate than others, that he's just here because he's the favorite's favorite's favorite.

Honestly, my knowledge of castle servants don't extend very far. Stableboy, manservant, steward, kitchen boy, scullery boy. That's it.

Anyway, I think Arthur ends up promoting Will when two end up bonding over hunting (http://mrinalinee.livejournal.com/5552.html?thread=22192#t22192), though I'm not promote to what. Something that enables Will to hang around Arthur more and talk about crossbows and tracking and stuff. Merlin's just relieved he doesn't have to go out hunting anymore.