If the overall consensus is I am not going to mail in those ridiculous postcards , then your chance of winning might be increased (perhas significatly), given that you mail in adequate amount of postcards... say, 10,000 of it???

To really increase the chance, perhaps one can do lots of MR. Before the MR, go to office depot and buy those envelop labels. Print all necessary info on those labels and in the flight, stick it on the back of a postcard while watching Aeon Flux...