Because the contract will now go out for printed stationery at all levels from letter paper to memo and no doubt envelopes- as indeed any large org., does- when in fact there is no need to have printed stationery of any type.
All that needs to has is to have each style as a template at the work station
or perhaps they do- may be I am 20 years behind the times.
Point taken re cost of running in house colour printers. But only valid if the stationery has a useful life time. 'Saving money' by bulk buying only to have it pulped at the next cabinet reshuffle/change of address or phone number- would dilute that effect somewhat.