Our amount per trip varies.
But the less we spend per trip, the more trips we can make.
When we first held AP's from Sept 2004-2005, we made 5 trips and spent a little over $10,000 for the year. It was 2 adults and 1 child at that point.
In 2006, we went to DLR for a week, and spent about $3500.
Last year, we stayed at a deluxe for 8 days with dining plan etc, and spent about $4600 total. We then went in November for less that $2000 (off-site timeshare).
Before our AP's expire this year, we will have 2 more trips and bring our yearly total in the 10-13K range.
We live pretty frugally outside of WDW vacation, this is our extravagance.