Not sure without thinking on it some whether the IRS has much to say, as long as you take in less than you had in it, you shouldn't be evading taxes. Most of these rigs cost more than they sell for, but a raffle is a way to get more than market value.
I think most of them are against state gaming laws and other statutes on the subject. Like maybe a 501c3 can have one like the 4-h club can raffle off a beef, but not an individual. Again, haven't thought hard on it and have done zero research, but I'm assuming trouble comes from a more local level, which is more likely anyway, local fun hater find it easy to call a local agency and have them look on it as valid as opposed to nosy neighbor asshole calls the IRS and they roll their eyes before they get to the right agent in the right department