It depends on how many are in your family/group and how likely that you'd be around when food was being served. We have 4 kids so need to get 2 rooms and I don't think that we'd get our $ worth at club level. A few years ago we were given club level privledges (long story) and we used it, but I was glad that I was not paying for it since we were very often in the parks when food was being served.
We've stayed concierge at WDW before (when we fit in one room) and really ate enough to make it worthwhile, but I have children who love to eat. And the food that was served (especially at the Polynesian) was wonderful. Same with the Animal Kingdom Lodge.
You really need to look at your individual situation and decide, but $35 extra seems like a reasonable amount, especially if you have a couple of snacking children.
T&B