Since when does any GA plank take max pax without a fuel reduction.
But Mr Viator's pitch was that - after you've put 10 pax in (with no bags), and the fuel you need to get to safeway, you'll still have less than MTOW. Somehow that's an advantage - which I guess it is, in case safeway is closed and you have to go further down the road to get to coles.
He'd be better off pitching the added safety benefits of SE climb performance from taking off at less than MTOW.
I know plenty of other aicraft have MZFW limits - but I've never seen anyone try to claim it's an advantage!