This is a odd service contract if it doesn't include toner. If it were me, I would tell Xerox I’m not interested in the 280 unless it’s an all inclusive service contract. I have a Versant 280 and also had a Versant 80. I would guess the toner usage is the same for both and I do remember seeing a final toner coverage for the 80 when the lease ended. Over the period of the 60 month lease toner usage was actually under 5%. I was surprised at this but then considering that I also print a fair amount of envelopes it does make sense. I have never used anywhere near 15 cartridges for full coverage on 1,500 13x19 and I do a lot of full coverage jobs.
The other issue with this contract is will your service provider be the sole provider of toner? If not, then that leaves you open to blame for any toner issues that cause damage to drums. Xerox had a significant manufacturing problem with toner that caused drums to fail prematurely, some drums failed instantly. I wouldn’t risk having them blame me for Xerox manufacturing faulty toner.
Unless there’s a compelling and very specific reason you prefer the Versant 280 I would walk away from it and go with the Ricoh. I do like the Versant 280 but I have no confidence in Xerox any longer, too many toner issues, drum issues and 2nd BTR failures when running coated stock. All these problems should have been resolved by now.