I've transferred 100K from the guild banker, to a new team leader.
And then had that leader transfer 20K to each member of the team, to cover training spells (don't need to anymore), buying glyphs and riding/mounts.

I also transferred 200K, when I was buying mats for the Vial of the Sands x5.

I was the only member of the guild, although I had 40 odd toons in it.
They were across five battle.net emails at that point.

I similarly transferred 100K with my DKs, when I moved them to Magtheridon to join the Zerg.
Most of that is sitting on my AH mule, who is selling whatever greens/blues drop while RAF boosting.
She grumbles, but does transfer enough to the new teams to buy their flying skills...

I have never been suspended or banned in any game I've played.