<font face="times" size="+0">Debi, i think the thing to remember is that if you choose to use DVC points to book a cruise, you are still paying dues on those points. since the fact that you pay dues remains a constant either way (rent+book w/ cash vs. book w/ points), many people might not feel it's necessary to take dues into account when comparing costs.
you could think of it as:
1) Total cash out-of-pocket if you book your cruise using DVC points = A. the cost of the dues on those points you used for booking the cruise + B. the $75 booking fee (are there multiple fees for multiple bookings?).
2) Total cash out-of-pocket if you rent out your points + book cruise with cash = A. the cost of dues on the points you rent out + B. the cost of the cash booking - C. the rental income from the points you rented out.
btw, dues for VWL this year are $4.2210 per point. and if you need advice on renting points out, feel free to post a new thread specifically on that subject, and i'm sure plenty of members can offer advice. HTH!
Edit: okay, just out of curiosity (and for fun), i decided to do some math on an example (using Debi's situation... hope you don't mind, Debi!)
Option#1 - Book 2 Adults in a Category11 Stateroom for Eastern Caribbean Cruise, May 1st 2004, costs 246 points.
$1038.37 = Dues on 246 VWL points
$75.00 = Booking Transaction Fee
$1113.37 = Total Cash Out-of-Pocket
Option#2 - Rent out 239 points + Book same cruise with cash.
$1008.82 = Dues on 239 VWL points
$2494.70 = Cash Booking after Port Fees/Taxes (quote from Buycruises.com)
($2390.00) = Rental income
$1113.52 = Total Cash Out-of-Pocket, plus you end up with a whopping 7 points leftover

heh.
so in this case, when you are booking so late, it's worth it to just use points. i'm not sure if Debi, you were wondering regarding the cruise in your countdown or not. it's a totally different story if you're booking another cruise farther in advance. if we used an alternate Value Season date, such as the Nov 13th 2004 Eastern Cruise:
Option#2 - Rent out only 156 points + Book 11/13/04 cruise with cash.
$658.48 = Dues on 156 VWL points
$2014.70 = Cash Booking after Port Fees/Taxes (quote from Buycruises.com)
($1560.00) = Rental Income
$1113.18 = Total Cash Out-of-Pocket, plus you end up with 90 extra DVC points that you could use on other vacations.
in the alternate case, you'd come out 90 points ahead. and,

in theory if you rented at something higher like $11/pt, you'd come out even more ahead (113 extra points).</font>