Having had a 750 in my youth, occasionally day dreamed about getting another Commando. But usually end up getting another Jap four for circa 25% of the price.
That one seems well cared for. But it should be, given it's mileage. As for the price, I'd guess it's just a starting point for negotiations. Doesn't seem that far off given the prices asked in the bike press. Unless modified, the 'leccy start on these is best regarded as a starting assistant with a warm engine, IIRC.