I think you're both right.
I agree with CanadaDisney05 when he says some financial analysis is needed before buying
DVC. Buying a timeshare to end up paying equal or more than the cash "equivalent" is just silly. There must be some form of savings, otherwise why commit to a long term purchase with less flexibility and more risk?
But, if the saving is 20% or 40% makes a difference if you can
afford it or not, then you shouldn't buy.
When I bought I followed the same line of thoughts that Crisi wrote: I was staying offsite or in values before DVC and going to WDW every 3-4 years. I knew I wanted to go more often and stay in better accommodations. I could afford to buy DVC without sweating and paying dues, flights, ticket and food for my extra stays is not a problem. I know I would pay more owning DVC, but I know also that would get more value. I do not care how much I saved over cash stays. I started keeping in an Excel file how much I saved every year to see when I would break even, I got tired pretty soon because it was pointless.