If you have too much duplicate content, your Hubrank will completely fall down. (this happened to some Hubbers). If your content is duplicated, whole or partially, you will see it as warning when you go to your Hub. If too many Hubs are duplicated, your Hubprofile rank can drop down to 1-15.
I do submitt Hubs to other websites, but not whole Hubs, only blurbs about them, with link pointing to Hubpages.
About duplicate content and Google pagerank:
Usually Google registers which website published content for first. That one who published it for first has the highest pagerank, the others do not benefit much from it.
You benefit from links that lead to your Hub, not if you duplicate your own content too much and too often.