My thoughts, if I may share.
I normally buy and returned raffle tickets when they were mailed. If I attended STAR, I tended to buy more there, as I have seen that at our raffle and at another that our dealer has each year to give away a Gold Wing, it seems that the odds of winning are a bit better if you buy right before the raffle. It has happened more than once at my dealer's raffle and I believe more than once at STAR. Regardless of that, this year I wasn't in the raffle. I was on another bike trip with my son during STAR, so didn't buy them there. It is no excuse, but without having the tickets in my outgoing mail folder, I wasn't reminded to send them in and so I forgot about going on line to buy them. I know that it costs time and money to mail tickets, but I think it is possible that we might get a better participation by sending tickets or having a page in STAReview with a ticket form that can be mailed.
As far as popularity of the bike, I am sure that has an effect on sales for some. I normally participate regardless of the bike, since I know that I don't have to keep the bike if I win, but I can still profit from winning. In 1996 I won a new Suzuki Bandit 600 in an AMA drawing. Since I had no use for it, I sold it, paid income taxes on the winnings and still had enough $$ left for me and Donna to take a nice vacation to Australia to visit relatives. Having said that, I believe that the popularity of a new exciting model does result in more sales, such as when we had newly introduced RC51 in 2000.
In any case, those are my thoughts for what they are worth. Bottom line is I think a newly introduced model bike with tickets available both on line and some type of hard copy may help spur sales. A page in several issues of STARreview would not add cost to ticket distribution, so I think that it would be worth a try.