No more than $5500. Canadian dollars. If you can't get a great deal on an 8th gen vfr, it's not worth buying. If you look on this very subforum, you will find several threads about how the 8th gens didn't sell well, and some of the clearance prices we have bought them for.
I don't know what the Canada equivalent is, but looking around Cycle Trader, similar bikes are going for $7,500 or more in US dollars, or just under $10K in Canadian dollars. If it's in great shape, maybe it's a deal.
Offer him 6000 and walk. He'll call you back in a few days. Point out that you need tires and fluids, also mention that adding luggage will cost two grand.
It's a buyer's market, and winter is right around the corner. Make a deal that makes sense, or wait. Another one will pop up.
I bought my vfr800 deluxe for under $8000, brand new four years ago. Last year they had a fire sale auction dumping the leftover bikes. Deluxes sold for five grand, base models were four. There are way more eighth gens out there than buyers. They are great bikes, but just not rare or valuable. People here selling their used vfr's are asking nearly what they cost new, but nobody is buying. They only sell when the price is closer to what the 6th gens sell for.