Depending on the article directory it is possible. However submitting the article with a different title and bio each time would be wise move. Different directories have different regulations, and you will find that the top article sites, which carry the most weight are the strictest.
All incoming links will benefit your hubscore and will increase traffic. Whilst I do not believe that Hubpages will mark you down for what you have said, Google may penalize you and knock all 20.
The best way of increasing your hubscore is to write more quality articles and to participate in the Hub community.