To not put too much of a fine point on the matter:
Blizzard can’t really turn a blind eye to something like this as, on either end, there could be easily ill gotten gold being moved and called ‘Server gold trade’. Much like the GPKD, they can’t really ignore the fact large sums of gold is being moved about and tracking where and how often X person get gold, move gold, how often from Y or Z, etc.
I can’t speak about your cast, but it’d be a good idea to avoid this kind of thing going forward.