on this site or in general? both don't seem wise to me. if someone's young, inexperienced, and desperate, they're looking for your most powerful spells. i put a warning on my Book of Curses, but that's it, i don't put little * next the the powerful ones.
online though, maybe if someones ranked novice, but that too is flawed because this ranking system doesn't work in actual practice, so someone ranked beginner could really be knowledgeable but has yet to be ranked so, and a person ranked knowledgeable could just be friends with someone in authority, but really be fluff [not saying that's the case, just making a point.]