Manipulate
1. to manage or influence skillfully
2. to handle, manage, or use, esp. with skill, in some process of treatment or performance
3. to adapt or change (accounts, figures, etc.) to suit one's purpose or advantage
The word was not meant to be a negative , however if the "normal" vacation pattern is 7 days or ususally includes weekends for most vacations (all not just
dvc or disney) and people who buy dvc start vacation Sun through Thursday they are manipulating there vacation habits to maximize their points.
If one is handling their points in a matter to purely get the most of them , thay are manipulating the system to ones advantage. I am not passing judgement or calling out anyone who does this as wrong, I have done some Sun -Thurs trips myself.