I had no idea about the raffles until recently, and I'm on ATP every day! Personally, I have to go searching for it, but it's probably because I leave ATP up on my computer in my web browser and it's usually on the Plant Database lookup pages, I rarely go to the 'home page' for ATP. If I'm not fishing around in the plant database for something or perusing the Daylilies forums, I'm usually in my inbox.
I agree with the idea that having a dedicated link for it would be great!