When considering maintenance costs, I think it is a bit of a wrong analysis to just consider the annual costs / point. To get a better comparison, you should consider the number of points you will use for your typical stay each year AND the cost per point to get the total costs.
As an example, if you wanted to stay in a one bedroom unit at your "home" resort for one week each year in late October, the costs in 2010 (but I only had 2009 dues amounts to use in this example) would be as follows:
Bay Lake - Lake View 240 points x $3.67 =$880
Boardwalk - Preferred View 215 points x $5.21 = $1120
Saratoga Springs - all views 192 points x $4.34 = $833
Old Key West - all views 171 points x $4.73 = $808
So, even though Saratoga Springs and Old Key West dues are more per point that Bay Lake Towers, the costs for your one week in a one bedroom unit are lower.
You also need to factor in other items, such as parking convenience, room size and amenities, convenience to the parks you want to visit, etc. Again, as an example, paying an added $240 over 7 days, or $34 / day to be at Boardwalk where I can easily walk to Epcot and MGM (I know - it now has a new name) would probably be worth it versus the extra hour or more our family would spend on the bus each day from one of the other resorts.