I was thinking about this some more.
I also think people don't look at timelines well. If your kids are younger, and you think "well, when they grow up, we can use the points for them and their families" or "they can inherit or use our contracts."
When I went from living in my parents house, off to college, and then got married, a few things happened....for several years I didn't want my vacation time to go to spending time with my PARENTS, when my friends were doing interesting things. And my parents, paying for college, had a hard time affording vacations while we were in school. When I got out of school, I was partnered, and I wasn't leaving him for vacation - so vacations with my parents would have been a plus one. But neither myself nor my partner (then spouse, then ex-spouse) had vacation time or money. The lack of vacation time and money as a young person starting out hampered my ability to vacation for a few years. And my parents, between my sisters and I, had ten straight years of college tuition, starting with me (none of us left with any loans, I think the biggest debt any of us had at graduation was $1000 worth of credit cards), affording big vacations for us, plus the assorted boyfriends, fiances and husbands that strode through our lives for those first fifteen years or so from the time I graduated from high school until my baby sister was in a place where she could afford to vacation, was just not in the cards along with tuition.
Now, my parents are retired and living on a restricted income. Its comfortable, but they didn't save enough to pay for us all to go to Disney. We all pay our own way....and guess what. The youngest doesn't like Disney, she'd rather sit on a beach. My middle sister and I both go regularly...but since a week with her husband and mine, plus my father, on the same vacation is no one's idea of a good time, family vacations are pretty limited.
Kids may not like Disney. They may like Disney, but there may be a gap of a decade or better between when the are kids and when they are stable adults with vacation time and money to spend. They may choose partners who don't like Disney - or don't think vacationing with the inlaws is a vacation.
Buy for what you need now and looking out about ten years. Don't buy for grandchildren before your own kids have hit puberty, for big family reunion trips you can dream about - but may not be as welcomed by your extended family as you imagine.