$9990 is a great price, no doubt about it. BUT, it's probably also a realistic price to move the bike, and not hold onto it for several months, lowering the price incrementally until it sells.
I think people see the asking prices for bikes, and assume that's what they're worth. I think the selling price is often 10-15% lower than the asking. So a bike that someone is asking $11,500 for might sell for $10,000, basically the asking price of the bike you're considering. I am going to guess that quite possibly, the seller you're dealing with won't drop the price much; he knows it's priced fairly, and priced to move.
I sold my 2013 Super Tenere with 10,000 miles, 3-piece OEM luggage set, and a Seat Concepts seat, but otherwise stock, for $6500. People said that I was crazy for "giving it away." Took one week to sell. Others similarly equipped at the time were asking $7500-8000 and would sit on the market for literally months, incrementally going lower until the ask was $6700-7000. All that means is they're not worth what the seller is asking, because I proved that there were buyers out there (I could have sold the bike 3x).