I think he posted it for the $650 tires. Even paying for tax, shipping, and install I don't see how they could cost that much.
Plus don't forget the tires' name.
As for the bike - good luck selling a 1991 CBR600 with 80,000km for $2,600. $1,500 if you're lucky.
... And how does CafeRay know it's well cared for? Oh, I forgot - he knows EVERYTHING! lol