We bought in 2007 for under $90/point direct and have 400 points now. I have a spreadsheet that I track every cost and every trip with DVC. Even figuring the best discounts for the times we have gone, we have saved over $88,000 in resort costs alone. For example, we just took a week long trip in a 3 bdr grand villa at SSR with all the family. Paying cash for the room would have cost us $18,221 just for this one trip! Our dues are just over $3,469 for this year, and even though we needed more points, our dues total for the needed points was still under $5,000. Quite the savings I would say.
It can still be affordable compared to the Disney resort room cost. So just some basic math. I just checked a Poly Deluxe Studio Resort View for October 3-10. To buy from Disney, the room alone is $8,724.39 for the week. This cost does not include tickets at all - just the room. If using points, it is 185 for the exact same dates. Current new buyer price for Poly is $226/point for 200 points. So the buy in would be $45,200. The current dues cost is $7.93/point, so dues for the year are $1,586. We will have to make an assumption here that the resort price and the dues will each go up about the same each year. Of course, there can be differences as some years the resort cost goes up a lot more than the dues, but some years the dues go up a bit more, but over that period it all should even out. Anyway, if we look at a 10 year period for that same cost, the resort room would have cost you $87,243.90. Between the initial DVC cost and 10 years of dues, that would have cost you $61,060. There is a savings on the resort cost of $26,183.90 over that 10 year period. I have no idea where people still claim that it takes upwards of 20 years to break even nowadays, but maybe they just don't care to do proper research.
If you even just look at 7 years, you would spend $61,070.73 buying from Disney, or $56,302 with buy in plus dues for that 7 year period. You are still ahead even after 7 years.
So I will still caveat all of this. DVC is not for everyone. You really need to want to go to Disney at least every other year and want to stay in deluxe accommodations. If you are ok with staying in value resorts or a person who commando visits the parks and just sleeps in a room, it is not for you.