Money orders are not the same as postage stamps and similar mailing services. Since drafts represent an actual cash amount, the merchant (i.e. drug store outlet or Canada Post) must absorb the cc service charges at one end and Canada Post itself at the other end providing the item/service purchased. With a spread of between 3% and 5% I would have problems seeing a Crown agency foregoing such revenue when a money order (i.e. cash) is at play unless there is a service charge for issuing a money order, that cc cost may be covered on a sliding scale of fee.