The price doesn't sound outrageous. Prices quoted usually are JUST for the quilting. If you want the binding put on, there'd be an added fee, as in this case, and this too seems reasonable.
Of course, prices vary from area to area ... and are dependent on the amount of quilting that's done.
Many choose to have the professionals do the quilting til they have mastered the piecing technique.
Some enjoy doing their own machine quilting and master it. Some hate it. Some never learn!
It seems you have stepped in here to ask questions.
Here's some for you ... what did your wife think about the fees? does she have any interest in learning to do the quilting herself?
Perhaps for now your wife is content to let someone else enhance her work with the quilting, rather than not being happy with her beginner quilting efforts!