Well, I think you're right, but the fact thet you cannot "recover" exp by killing the regenerating creatures is really nasty. with my ususl rituals I don't care, but when it comes to training my joker, it remains at 0 exp all the time for this.
I think that the idea behind the ritual is good, but with some adjustments it would be better, I think...
Anyway, the game is not complete yet, so let us not complain about temporary things so much, they'll probably be fixed when time comes for a more complete version...