Can your daughter participate with the group if you book your trip independently? If so, I'd do that. If not, you just have to decide whether the experience for her is worth the expense.
A couple points...why is it that you say the meal vouchers are a joke? If they are the same ones we use with our groups, they entitle the holder to a drink, entree with side, and dessert, at select locations. And no, they are not free. I believe you are correct, they are $18-20. Here's a pic of the back of the voucher to show the locations it can be used:
MEAL VOUCHER LIST by
Sue, on Flickr
Charter buses are expensive, especially if you have one for the whole trip. How much that adds per person depends on how big the group is, but it can add a significant chunk. It's a necessary expense, to get the group where they need to be on time for competitions or performances.
Most groups also comp their directors, meaning the cost for them is shared by all the other members of the group. That is not up to the travel company, it's up to the group. Again, how much this affects each individual's cost is determined by how big your group is and how many staff are comped, if they do this at all.
Those are just some possibilities. No one in this business is getting rich, but we do need to have a profit to stay in business. I know the people I work with do it because we love to create great experiences for kids.