It really depends on where you eat, and what you use your wishes for. If you are planning on using your wishes strictly for meals, you really need to sit down, and figure out where you will be going to eat, and what you are likely to get. For example, if you are planning on using a wish for a character breakfast each morning, you may not get your money's worth from the wishes, as the cost of a character breakfast is less than half the cost of two wishes you must pay for each night, so then you have to make up the cost in another wish.
If you are planning on using the wishes for tours, recreation, or spa treatments, you can definitely get your money's worth.
When I used the wishes, I had a total of six wishes which cost $217. I used it to take two tours, three meals (including one very expensive meal at Wolfgang Puck's), and one memory box. I spent well over $300 on those items, so I definitely got my money's worth.
I would suggest sitting down and figuring out how you would use your wishes, and deciding if it would be worth it for your family.
Karen