"If you'd be willing to come talk to me once a week, or more often if you notice an emergency, and tell me everything you noticed in that week, I'd be willing to offer -" Mana! Not a lot, but some! Or discounts on spells worth that much mana; she's willing to do either and has a fairly impressive selection of low-mana utility spells. There isn't higher pay for more useful information (Jinye decided the incentives balanced better that way) but there also isn't less pay if you happen not to pick up anything useful. "If you notice someone dating someone new, or breaking up with someone, or quarreling, or if anyone has more mana than you'd expect - or less - or if anyone's in poor health, or hasn't been coming to classes..." Jinye is prepared to list the kind of information they're buying in fairly exhaustive detail! It is pretty exhaustive information! "The costs to not knowing that purple socks mean an association with Sui Mei are usually nothing, but might matter."