I don't agree with this. If you are the sort of person who would be staying in Deluxe rooms onsite at least semi-annually without DVC, then DVC can give you the same quality room for a much lower price point, or a much nicer room at a similar price point. This is using an amortization rate of 8%, which is quite conservative.
If you are the sort of person staying in Deluxe rooms onsite at least semi-annually, you aren't making decisions based off long term financial benefit. You are making decisions - like we all do - that balance financial decisions with decisions made that give you emotional pleasure. Which is why saying "you should make this decision because its the best financial decision" is sort of useless. The BEST finanicial decision is STAY HOME and put your money in some nice diversified investments. Once you decide that won't be emotionally fulfilling, its just a question of 'how much money are you willing to spend and for what experience.'
BTW, this is particularly interesting since the OP for this thread has had two trips in Value resorts - which doesn't mean she isn't a good candidate for DVC - just that she may be changing her priorities from financial to emotional.