All of the above are totally correct. But if these considerations are not factors, your MLW can often be increased. How? An operator will generally find the manufacturer rather accomodating. But they will have to have large amounts of cash thrown at them. You will almost certainly end up with reduced life cycles on many components and shorter maintenance intervals. You will often pay more for every landing as well. For some this will be worth it but for many it will not not.
PM