Hi Aba, we ourselves do refurbish used machines and resell them with a warranty, but my point was that it will be difficult if not impossible to buy a used wide-format ink based machine from one party and then get a service provider to sell you a service warranty on it without them being the seller of that machine in the first place.
When speaking about industrial-sized machines (as opposed to commercial ones), then, yes, I'm sure that you'll find someone to refurbish them on site and then sell you a service warranty on it as long as they have done the refurbishment themselves, but I think we are talking about somewhat different markets.
Personally, were I a business owner, particularly in Europe or North America, I would be willing to pay a bit more for a new (and current) unit which will come with at least a full year warranty from the manufacturer. I would then make sure that I can purchase an extended warranty from the service provider for a minimum of another year beyond that.
Additionally, many manufacturers run promotions where they will sell the machine with a free second (and even sometimes third) year warranty with the purchase of the machine.
Having a good service plan on any piece of equipment is like having good insurance coverage - it is part and parcel of your operating plan and expenses and will save you many headaches in the long run...
Cheers