I have read on some Changeling books that accepting a gift from a changeling is dangerous, because enchanted mortals are more vulnerable to changeling's magic. I have read the same about drinking changeling's blood (if you are a vampire).
But when reading cantrip and enchantment systems the only thing I have found is that you don't have to spend glamour to cast a cantrip to an enchanted being. Given that the changeling must spend glamour to enchant that person, it doesn't sound like a huge advantage, unless you are planning to cast several cantrips to the same target (which isn't very normal).
Is there another advantage when casting cantrips to enchanted targets?