In a word, yes.
I've written a few good pieces of code of which I'm very proud. And it's even more sad when you have to give it all away beacuse it's for $client. It's almost like watching a child leave the house (though I wouldn't really know this as I don't have kids). It's hard to justify making a 'copy' of some code that is brilliant, pretty, or otherwise cool in your book, just so that you can keep it with you. Even moreso when $client doesn't like the idea of any copies of said code existing outside of their ownership.