"Thank you.  You've just made that part of me very happy."  Then he pokes her in the ribs, hard.  "That said, your prices make no sense, your earning power is at least twelve gold per week, and that's more like two gold per day than half a gold per day... I guess as a wizard you could potentially use up all your magic in the morning and then be available for naughtiness in the afternoon and evening, so maybe it doesn't trade off against your magic job.  But still, that can't possibly be a fair price for you, even if you believe it is."

"Thank you.  You've just made that part of me very happy."  Then he pokes her in the ribs, hard (but not Carissa hard, not as hard as possible).  "That said, your prices make no sense, your earning power is at least twelve gold per week, and that's more like two gold per day than half a gold per day... I guess as a wizard you could potentially use up all your magic in the morning and then be available for naughtiness in the afternoon and evening, so maybe it doesn't trade off against your magic job.  But still, that can't possibly be a fair price for you, even if you believe it is."