Ves had become fascinated by the power of blood when he initially conceived of the Carmine System.
Blood was both a carrier of life and a medium of power.
By absorbing the occult knowledge contained within an enlightenment fruit, Ves had learned many powerful properties and nuances of blood.
Ves knew so much about the more mystical aspects of blood that he could probably do a good job of impersonating a member of the so-called Blood Cult!
Of course, Ves did not bother to waste his time on reproducing the archaic and outdated methods of this forbidden organization.
The knowledge he learned from System mainly served to provide him with the building blocks he needed to come up with his own innovations!
This was why Ves had great confidence in the Carmine System. Perhaps it might look like an abomination to other people, but he considered it to be a brilliant fusion of different concepts.