Can you be a winning player playing like Gus Hansen online?

To make that statement assumes you understand Gus's strategy, which is highly unlikely. What you are referring to our maniacs. Gus Hansen is not a maniac. He is unpredictable and that is his strength, however, he is also very gifted at reading people and, if you notice, he's pretty good at getting away from those goofy hands when he needs to. Go ahead and try to play the hands he does, I doubt you'll have close to the amount of success as he has. The man knows exactly what he is doing.