Well, it could be. It depends what activities you all take part in. You can rent boats at the marina, go horseback riding, do the kid's activities (tye dye, crafts, etc.) and it will cost you more because they cost extra. But if you just swim, mini-golf, hike, etc., it shouldn't be too bad.
We went two summers ago and found a good deal on vrbo, for four nights mid-week, I think for $399.00? That was on the time share side though, you can go to both sides and use the amenities. There is an internal shuttle to take you where you want to go. It's a beautiful resort. The resort restaurants were semi-expensive if I remember right, but there is a deli that wasn't too bad that had sandwiches, smoothies, etc. Of course, Branson is only minutes away and they have tons of restaurants. And if you stay on the time share side, you have a kitchen or kitchenette.