Sounds like a deal to me, here in Japan, any SP bike will command more than that, they are really rare bikes and the prices keep going up, there are nice condition MC21 SP bikes up for sale here in Japan for like 5,000 USD to 9,000 USD depending on the condition and the prices keep going up. For MC28 bikes I have seen some nice low mileage SP bike go from 7,000 USD to well over 11,500. Better get that bike while you can if it is a real SP.