Why don't you ship Swing apps?

Time and time again I hear that there are no Swing apps (or no good swing apps). We can come up with lots of excuses and explanations but that doesn't get us any closer to having more Swing apps. So I'd simply like to ask all of you. Starting with the assumption that all of you are Java developers in some fashion or another, but not necesarily Swing developers, I want to ask you:

What is keeping you from shipping a Swing application (or a desktop java app in general)

I really want to know. I have my ideas but there is no substitute for hearing directly from the developers in the field building (and shipping) real apps.

Thanks, - Josh