If you look at that history, this is not the biggest jump in price:
1991 $49
1992 $53 8%
1993 $57 7%
1994 $59 4%
1995 $62 5%
1996 $63 1%
1997 $63 0%
1998 $63 0%
1999 $65 4%
2000 $66 2%
2001 $74 11%
2002 $78 6%
2003 $84 7%
2004 $84 0%
2003 $89 6%
2004 $95 7%
If it did just increase at the rate of inflation (say 3%), the price would be $76.25.
However with
DVC II do get the more years and the ability to book at a wider variety of resorts.
Hmm. To get a studio at BCV would cost 6,431 points for an entire year. Let's say the average rack rate is $500 for that room. So one night costs you on average 6,431/365=17.62 points. So each point is worth about $500/17.62 = $28.38
So figure a discount rate of 10% (not unresaonable over a long time frame). The present value of getting $28.38 a year for 37 years is $275, and the present value for 50 years is $281. So that means the DVC I points should be worth about 2% less than DVC II - which is not the case.
Either way, though, the value is much greater than the price. Even assuming you just rented out all your points each year at $10. That means 1 point would give you $10/year for 37 of 50 years:
PV for 37: $97
PV for 50: $99
Still below (just barely!) the current price. And if you think you'll never get 10% return on your money again, then it's an even better buy (lower discount rate means higher pv).