Since you're raffling such a high ticket item, you run the chance of being noticed by the local authorities. There is quite a lot of work that needs to be done to run a legal raffle in most states, including New York. Read the following link for more details:
http://www.racing.state.ny.us/charit...aqs_raffle.htm
For example, minors can not sell raffle tickets legally. Also, you have to register with the state gaming and wagering board and the city as well.