if the pieces are already cut out for you; and
if you have a very hard time cutting your own; and
if you'll be using expensive material no matter who does the cutting; then
i would consider the extra expense to be worthwhile.
-you won't inflict as much pain and discomfort on yourself (priceless)
-you won't risk wasting fabric by cutting inaccurately (saves what you might have had to spend buying more fabric to recut the wonky pieces.)
-your time is also valuable. ;-)
if it fits into your budget, i'd say go for it. :-)