interesting this came up:
looking into a used x5. at the local dealer, there are two:
04 x5 w/ 32,000 miles CPO - has CW, PP, Rear Climate
05 x5 w/ 31,000 miles CPO - has CW, Rear Climate (no PP)
They are asking the same price for both. Considering the 05 has leatherette, not having PP with all the options may have something to do with the much lower sales price. Perhaps the dealer has a harder time selling without PP, which may affect your resale value. By this comparison, it looks like PP at least pays for itself when selling.