Originally Posted by -Nico-
Illegal? That sounds a bit extreme, and besides, I didn't say what type of compensation.
It is illegal as stated in the EULA (End-User License Agreement):
"...You may not:... (10) commercially exploit the Software,..."
That is the way it is for this game series. Others are not as strict(ie: some xbox 360 stuff), but in others it is not explicitly prohibited, but is frowned upon.