That would all depend on what, "a little love is".
I would probably guess he's trying to fix something by changing those spark plugs instead of being anal about the maintenance on the car (He's selling it who gives a **** about spark plugs?)
Personally, I wouldn't pay 6 grand for a wrx with 170k on it especially if the ad admits it has flaws. Save up a few more grand and get a nice low mileage wrx. People drive these cars as they are meant to be driven.