My grandmother used to put scratch-off tickets in everyone's stockings. I'm not sure if she still does, but probably! She's a bit of a scratch-off fiend. Slot machines, too. And you know what? She has repeatedly won more $10,000 a year from these endeavors. I remember a pretty bitter phone call when she announced that she won $10,000 in one casino trip; at the time, that was how much I earned per year teaching at a university.
I never won big from the stocking scratch-offs, but it was always fun scratching them all off together to see if anyone would.
I think it sort of kills the fun by REQUIRING the purchase and sharing of tickets, though!