That's more systematic incompetence and happens all of the time.
The reason is easy -- capex for new equipment is easier to get and more nebulous. The new printer may have started life on a budget spreadsheet as a truck.
Opex is hard. It usually works like this: Some poor clerk had no fricking idea how many toner cartridges or replacement staplers were needed, so he wrote down a bullshit number. Some upstream beancounter patted himself on the back and zeroed out the supply budget to make his powerpoint look good, because he screwed up and didn't order enough bullets or whatever.
Now you're stuck, and whomever orders stuff orders a printer to get toner, which is ultimately cheaper than getting some sort of special clearance to spend opex money that wasn't budgeted.