In the end, Ves chose to decide with his brain instead of his heart.
He would like to do nothing more than to punch Lady Romanda in the face and rat her out to the mechers, but that would not accomplish anything aside from making him feel happy for a short moment.
Ves hated the cosmopolitans. He distrusted the Horizon Cell, considering them to be barely better than their much more destructive counterparts. He also did not believe that the cosmopolitans would be willing to assist him forever.
Yet that did not invalidate the reasons to establish a tentative form of cooperation for the time being. Ves could not deny that he would definitely become better off if he accepted the proposal and colluded with the cosmopolitans.
He imagined that this was far from the first time that someone had made a dark bargain with the cosmopolitans.