Like the original poster, I too have a fam of 5. And that is why we love the
dvc rooms -- I just can't call cosleeping in a cramped hotel room a true vacation. With 3 kids, restaurants can be great, but they can also be eXhAuStInG for parents trying to keep a crew in control! I love being able to serve a simple, relaxed meal in our 2 br villa. We are 2br people all the way.
As far as math is concerned, I am NOT saving money, that is a FACT. DVC costs a pretty penny to join, and even tho' we're all paid off for our contract, there's always the dues/fees. Yes, you can find cheaper places, or you could simply rent DVC points from someone instead, and avoid the eternal commitment. I really don't see anything that isn't permanent as being an "investment", per se, and this carriage ride becomes a pumpkin @ 2042. As for concierge collection, even it doesn't truly pay off for a fam of 5 wherein 3 are kids. I can't see myself taking the kids to most of the very posh resorts listed -- we would do better to go to a Homewood Suites. Perhaps it's a boon when you're an empty nester, but not for us right now.
So why then did we buy? IN our case, there was one prime factor that made it attractive: we HAVE to use it. Normally, all our vacation time is sucked up visiting family. Don't get me wrong, I love my family and ILs, but they can't accommodate our fam of 5 well either, and it just starts to feel like you're doing the World Tour For Peace, definitely NOT a vacation! By buying DVC, we were PROMISING ourselves and our 3 kids that we would take a vacation. A Vacation Commitment! Originally, we bought points to afford about a 5 day stay every year... but the whole family agreed we would RATHER have a big 11-day stay every other year! Our extended families would never ever allow us to pay for a hotel room -- oh my no. THey simply woudn't go. Yet for some insane reason, if we offer DVC, they jump at the chance. SO we still get to see family (and fulfill our family ambassadorship, if you will...) BUT we get to do it somewhere FUN! (And with enough beds for all, and to all a good-night!)
I too have a small fund set up for our first add-on. If I work overtime on a project or get an unexpected bonus, the extra $$ goes into the account. I think it's a very prudent way to go -- if we don't buy an add-on, we will surely use it on our next big spree to WDW.
Cindy