You can't ask for, trade, or sell keys. You are allowed to conduct giveaways, and if you get modded for doing so either it was wrong or you were modded for something else.
I disputed it up to head admin and they said offering keys for trade, sale, begging or free are against TOS.
Was it more than a year or two ago? The rules were relaxed at some point in that timeframe and I don't really remember what the policy was before, but it's entirely possible giveaways were "legalized" at that point.
All Hail Rask Actually, contrary to popular belief, signs cannot get angry, as they are not alive.- AlgernonMabus