It might be worthwhile to separate the information about codes not being reusable and to add an FAQ that deals with things like why support volunteers can't give out codes. I'm not sure about what should be in that one, if it should exist at all.
103 also points to /paidaccounts, and should probably be changed to point to the FAQ instead.
I was going to suggest a rewrite to FAQ 104 at the same time (since it also mentions codes), but
algeh posted about it already. 