to add, in comparison with the Velo Quebec trips I have done (Le Grand Tour) this 5 or 6 day trip seems very reasonable. Dont know how this is organized, if the route is interesting etc, but certainly seems a great price to have a route planned out, and your baggage carried.
As you say, thats the great thing with bike touring, one can have a wonderful trip that doesnt cost much past equipment costs (bike, camping stuff etc) if you stay in campgrounds and dont eat in restaurants.
have fun whatever you do.