You have to look at the price but you also have to see what is included in the all inclusives. The AI plans at the Royals are overpriced imo because it really is just a meal and beverage plan. You really aren't getting anything else that isn't already paid for by the owners mf's. Even the food isn't "all inclusive" as they have surcharges on a number of items.
Some AI plans include round trip transportation to the airport, golf (and golf clinics/lessons), daily activities that are a step above games around the pool, like a sunset cruise, afternoon snorkelling by boat, sea kayaks, catamaran s, paddle boards all with lessons/instructions etc. The Royals pay for daily maid service as part of their mf's but not all do and that is part of the ai fees at those resorts. So $100 a person a day can be cheap or expensive depending how "all inclusive" the resort is.
In almost all cases getaways (II) or extra vacations (RCI) work out better for ai's than doing exchanges and even then some are still no bargain.