I was thinking more along the lines of a sacrifice... you know it cost 20 AP, and you can only do it once per ritual.
I would like the option of having a good rit and going, "Oh this one creature would make this better because of this...."
It's easy enough to create a new ritual, but sometimes its just not convenient...
It's not a big deal either way... just brainstorming, thought it sounded good. Plus, I don't tend to think of the 'misuse' side of things too much just because I'm not THAT kind of person... *shrug*