Well like Jon said, you dont have to fight to get the bloodseal on your stuff. Personally, i think it is a waste of money. You have to go out and grind anyway to get your bloodseals for your weapon and armor.
Ppl may say you get the bonus of the bloodseal, but they are not all that. Cuz you still have to go out there and grind away bloodseal or not. But if you got the money, go for it.
To Kill or not to Kill, it just matters as to how bad you are!!