I used to own two weeks there but I sold them last year. In the past the all inclusive plan has been optional and it could be purchased for as little as three days, allowing you to be on your own for the other days.
Its not exorbitant when you compare it to the prices for meals and drinks without the plan. There are no restaurants within walking distance and very few that are a short taxi ride away. We found that even though a local restaurant could be less costly, the taxi fee would even out the cost. You could rent a car, however, roads are in generally poor condition and poorly marked, if marked at all.
The resort has some dinner shows that are generally in the $65-$75 pp range, not including drinks. At best you might get away with $100-$125 for a typical dinner without drinks.
Add breakfast and lunch along with an occasional cocktail and you will be way over the all inclusive cost.
If you both dont drink any alcohol, and both skip a meal, then the all inclusive may not be cost effective. However, if you enjoy a couple cocktails with dinner and occasionally during the day, as well as enjoy your meals, I think youll find the all inclusive is worth it versus paying as you go.