Rent or buy, the issue is that if a harvester breaks down in the field
it could be 3 ~4 days before a technician gets to the field, diagnoses
and has to order a part, wait for said part and come back to your field to
replace it. That machine being down for two weeks during harvest could
mean the farmer losing a whole lot of money.
If you are someplace like rural Australia the closest tech might be 1000km away.. if they haven't installed the hacked firmware they can't even service them without a tech or the tractor shuts down.