A 5000ac farm would have one employed mechanic/engineer I would expect. Pretty simple therefore to buy a used machine (get him to look at it first), then if something breaks, or needs repair....they've got someone on the place to fix it asap at a sensible cost without risking downtime.
Most farms either buy new to try and minimise downtime and accept this has a cost. Or buy used, accept some downtime/repair cost and pay less as a result.
This farm has the ability to do both - buy used and pay less, but having a sensibly priced mechanic available at the drop of a hat, the downtime/repair costs are minimised too.
A full time mechanic on 5000ac is a big cost and the dealer tech would probabaly still be needed for a lot of repairs