Well, you cannot deliver apps on iOS/Android/WP7 at the same time for a small budget in a short time natively. With Phonegap you can. Most companies really don't care that it is not that polished because most users don't care. We are talking about apps for the average company, not for companies where the app IS their business or anything like that.

The pizza chain with nice revenue rather has a Phonegap app THIS WEEK on all platforms which works a bit flaky, but works, than having to wait a few months to churn out different versions tweaked and tuned for all seperately.