Or if they do so successfully, then no one knows, which is the point!
It could be... but I think the people prefer better to spend their gold in recruit more soldiers, than making them look stronger or weaker, before they know if it will be useful or counter-productive. Maybe if you could do it in any moment and region... but as it is, is too 'slow' and difficult to coordinate...
I'm sure in some occasions can be useful, but I think the ignorance about the enemy must be continuous, and not something about 'troop camouflage'.
