Generally speaking, since we travel mostly for leisure and to resorts, it's worth the difference between the cost of the least expensive room and the room we would normally pay for, which is at least partial ocean view, and breakfast.
In most cases, we calculate that to be at least $150 per day, times at least 16 days, or about $2400. So requalifying for anything less than that is what we shoot for.
I haven't added in the value of the hors douvres in the evenings that we can sometimes make a meal of if we don't feel like going out.