When you view the amount of money in the abstract, the answer seems like it should be no. But when you consider how much you'll end up spending on dinner that night anyway if you're staying on site, the calculation seems to be a little different. For example, we've had plenty of sit down dinners that cost almost as much -- one in paticular at Spoodles that was very disappointing -- where we sort of wish we'd gone to HDD for just a little more.
I think it's a fun splurge to do once. The show's ok, the food's a little better than average considering it's made for such a large group, but the highlight for us was making the trek to pioneer hall. The setting is cool if you're not staying at FW.