Bot's would enter the raffle and not just one, 100's 1000's of them would... and those bots would be RMT bots, and slowly consume the wards, then sell FC houses for 100 dollars real life money and more, that is what the raffle would do.

The raffle would most likely also crash the server due to the relocation system, which means if you got a house in Shirogane and want to go to the Mist... then you relocate to that place in the mist directly, which frees up a house in Shirogane and consumes one in the Mist.