If you attempt to buy a keep NPC with Guild Bountypoints, and do not have the permission, you still get put on a timer where you cannot buy anymore, despite no NPC being deployed.
Expected: Error message "You do not have permission", then able to buy the NPC with other currency.
Addition:
[17:34]Ebenezer: Also happens if you try to use a contract and don't have one in your pack
[17:34]Ebenezer: I'd guess if you didn't have 27 gold and tried cash, you'd get timered as well