Picking the perfect raffle prize can be simple if you follow these simple steps and apply them to products you may have in mind. Once your company is up and running I would then start to add-in your historical sales data that can help you "smell what sells"
From my experience, these are the three aspects that go into the emotional decision, by a customer to opt into participating in your raffle. You do not need to match all three, but the sweet spot is in the middle.
Capitalise off the desire of luxury brands and items
Think about the accessibility of the prize, is it hard to obtain? if so its also more desirable.
The customer is always right! Study your audience and go out of your way to please them!
I hope this has given you some ideas or even helped you whittle down your current ideas for what might succeed most on your raffle website.