Just received my second prize from them last week, it was for a sweep that ended in November last year. Not only do they fulfill, but they redraw ad nauseum if they don't get takers.
The Woman's Day's PR person who has the job of notification tends to use a gmail account instead of her corporate issued womansday.com account for notification notes which probably causes more people to pause when responding to those notifications as well.
I always assume that as more recognized brands with a more diverse audience, the magazine sponsored sweeps generate more traffic than a lot of the other sweeps too which means they're pulling a name out of a much bigger bucket. So, even with a single magazine sponsoring 30 different drawings with 300 different prizes every month, they're still taking daily entries from a LOT of people. So your odds are going to be smaller than if you're the only person who stumbles onto that obscure contest on that blog no one reads.