I don't like the "rockstar" label, but excellent software developers are more than worth it, as Fred Brooks knew years ago...
Study after study shows that the very best designers produce structures that are faster, smaller, simpler, clearer, and produced with less effort. The differences between the great and the average approach an order of magnitude.
I don't have the book in front of me, but there is a reference at http://en.wikiquote.org/wiki/Fred_Brooks.
That book is worth rereading every few years.