Not sure where you got your numbers from...but they're quite far off. We may do one multi day trip a year max and it'll cost us around $1,500 with the dining plan. Over 50 years...that's $75k. If prices come down at some point, it may be something we revisit, but for now, we're fine not being part of DVC.
Since we're local...we typically just do day trips and if we get the itch to stay overnight, we find a cheap hotel off property that is $50/night...but staying overnight is rare.
I get my numbers with a lot of research, and the fact that we won't stay anywhere else but on property, and in a deluxe resort.
The only way you can do what you are saying is by staying off-site or in a value. DVC is definitely NOT for you. Not even sure why you would consider it. DVC is for those that stay only at deluxe resorts.
So let's do some math. We'll say that you love the Boardwalk. You want to go during a slower season, so Sep. 9 - 17. At the Boardwalk, a garden/boardwalk view room would be 107 points for the week. There are contracts available via resale that have 150 points for $15,000. More than enough for your week, and you can bank the extra points for a few day longer stay every couple of years. The maintenance fees are $6.18/point. So your dues are $927/year. So for ease of calculations, we will say that maintenance fees won't go up, and Disney resort room costs never go up.
For your Boardwalk points, you will spend the original $15,000 investment, plus dues over the life of the contract (26 years, as they expire in 2042) of $24,102 for a total of $39,102.
So checking Disney's web site for the exact same week at the Boardwalk Inn with a water view (similar to the garden/boardwalk view), it will cost you $4,158 for that week. So again for ease of use, the rates never go up, you are spending $108,108 for the same resort at the same time. Even with a 30% discount (which WILL go away at some point) you are still spending $75,675.
By buying into DVC, you are saving $69,006 over the life of the contract, and that doesn't even take into consideration that you bought 150 points, and can stay a few more nights, which adds even more to the savings. Even with a 30% discount on a room, you are still saving $36,573. That's real savings, not fake money. And also remember that our maintenance fees have typically gone up less that Disney's resort fees. Oh, and I'm also not adding in the over 12% resort fee that you are charged, that we are not charged.
So for those of us that it works for, we will save a ton of money compared to you. I am absolutely the first to admit that DVC is NOT for everyone. It is targeted at a specific demographic, and if you don't fit that demographic, it isn't a good deal for you.