On that note, if it happens be prepared to see threads for '*** promised to repair my stuff, but stole it!!' Not saying that because i honestly care, but for some this is a major issue so i'm pointing out that it will happen.
There could be an "entrust" option, like what we have for Enchant.
Like Faefellah referred, the idea needs some work, and should be expanded to other "types" of gear, for example, Carpentry could do repairs for Bows/Crossbows, Handicraft could repair Instruments, Tailoring could repair Magical Clothing/Clothing and Blacksmith Heavy Armor & Light Armor/Weapons?(I know it was referred already but hey, expanding on the idea.)
Enchanting could repair staffs and Wands?
Another thing is that should cold a sum of gold set by the person repairing, a % should go to the player another % should go to the system(another gold sink, would still work as one, but players could get a bit of coin, the Entrust system Epsilon is a good idea on that regard to avoid scams.)
Darkssg the idea is good, but update it and make it more constructive with the help of everyone =) we never know what the Dev's/Admin's/GM's might think of it right?
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