[Q] Character Trading System

Is there gold cap while posting on Character Trading System?
When I try to post character with alot of gold everything seems fine > "Your character ********* has been successfully put up for sale.", but few minutes later the character is sent back into my account with "Expired, exploit attempt" status. I really don't get what's wrong since the character is level 90, naked, only with gold. Tried with and without "Include Inventory" feature, but its same.
Tried to post it with zero gold aswell and no problems so far, the character is successfully posted.
Any ideas?

ps
Frostwolf realm