Price paid for ticket is irrelevant on MU coded flights, as with most partner marketed and sold flights: MQDs are calculated as a percentage of distance flown. This can be favorable or unfavorable depending on how good of a “deal” the ticket is, but in aggregate the values are set to be about equivalent across all passengers.

In some cases, for airlines that Delta has a financial stake in, the values are particularly favorable to encourage bookings on certain partners - and MU is on that list.